cpython/Lib/test/test_coroutines.py

2484 lines
68 KiB
Python

import contextlib
import copy
import inspect
import pickle
import sys
import types
import traceback
import unittest
import warnings
from test import support
from test.support import import_helper
from test.support import warnings_helper
from test.support.script_helper import assert_python_ok
try:
import _testcapi
except ImportError:
_testcapi = None
class AsyncYieldFrom:
def __init__(self, obj):
self.obj = obj
def __await__(self):
yield from self.obj
class AsyncYield:
def __init__(self, value):
self.value = value
def __await__(self):
yield self.value
async def asynciter(iterable):
"""Convert an iterable to an asynchronous iterator."""
for x in iterable:
yield x
def run_async(coro):
assert coro.__class__ in {types.GeneratorType, types.CoroutineType}
buffer = []
result = None
while True:
try:
buffer.append(coro.send(None))
except StopIteration as ex:
result = ex.args[0] if ex.args else None
break
return buffer, result
def run_async__await__(coro):
assert coro.__class__ is types.CoroutineType
aw = coro.__await__()
buffer = []
result = None
i = 0
while True:
try:
if i % 2:
buffer.append(next(aw))
else:
buffer.append(aw.send(None))
i += 1
except StopIteration as ex:
result = ex.args[0] if ex.args else None
break
return buffer, result
@contextlib.contextmanager
def silence_coro_gc():
with warnings.catch_warnings():
warnings.simplefilter("ignore")
yield
support.gc_collect()
class AsyncBadSyntaxTest(unittest.TestCase):
def test_badsyntax_1(self):
samples = [
"""def foo():
await something()
""",
"""await something()""",
"""async def foo():
yield from []
""",
"""async def foo():
await await fut
""",
"""async def foo(a=await something()):
pass
""",
"""async def foo(a:await something()):
pass
""",
"""async def foo():
def bar():
[i async for i in els]
""",
"""async def foo():
def bar():
[await i for i in els]
""",
"""async def foo():
def bar():
[i for i in els
async for b in els]
""",
"""async def foo():
def bar():
[i for i in els
for c in b
async for b in els]
""",
"""async def foo():
def bar():
[i for i in els
async for b in els
for c in b]
""",
"""async def foo():
def bar():
[[async for i in b] for b in els]
""",
"""async def foo():
def bar():
[i for i in els
for b in await els]
""",
"""async def foo():
def bar():
[i for i in els
for b in els
if await b]
""",
"""async def foo():
def bar():
[i for i in await els]
""",
"""async def foo():
def bar():
[i for i in els if await i]
""",
"""def bar():
[i async for i in els]
""",
"""def bar():
{i: i async for i in els}
""",
"""def bar():
{i async for i in els}
""",
"""def bar():
[await i for i in els]
""",
"""def bar():
[i for i in els
async for b in els]
""",
"""def bar():
[i for i in els
for c in b
async for b in els]
""",
"""def bar():
[i for i in els
async for b in els
for c in b]
""",
"""def bar():
[i for i in els
for b in await els]
""",
"""def bar():
[i for i in els
for b in els
if await b]
""",
"""def bar():
[i for i in await els]
""",
"""def bar():
[i for i in els if await i]
""",
"""def bar():
[[i async for i in a] for a in elts]
""",
"""[[i async for i in a] for a in elts]
""",
"""async def foo():
await
""",
"""async def foo():
def bar(): pass
await = 1
""",
"""async def foo():
def bar(): pass
await = 1
""",
"""async def foo():
def bar(): pass
if 1:
await = 1
""",
"""def foo():
async def bar(): pass
if 1:
await a
""",
"""def foo():
async def bar(): pass
await a
""",
"""def foo():
def baz(): pass
async def bar(): pass
await a
""",
"""def foo():
def baz(): pass
# 456
async def bar(): pass
# 123
await a
""",
"""async def foo():
def baz(): pass
# 456
async def bar(): pass
# 123
await = 2
""",
"""def foo():
def baz(): pass
async def bar(): pass
await a
""",
"""async def foo():
def baz(): pass
async def bar(): pass
await = 2
""",
"""async def foo():
def async(): pass
""",
"""async def foo():
def await(): pass
""",
"""async def foo():
def bar():
await
""",
"""async def foo():
return lambda async: await
""",
"""async def foo():
return lambda a: await
""",
"""await a()""",
"""async def foo(a=await b):
pass
""",
"""async def foo(a:await b):
pass
""",
"""def baz():
async def foo(a=await b):
pass
""",
"""async def foo(async):
pass
""",
"""async def foo():
def bar():
def baz():
async = 1
""",
"""async def foo():
def bar():
def baz():
pass
async = 1
""",
"""def foo():
async def bar():
async def baz():
pass
def baz():
42
async = 1
""",
"""async def foo():
def bar():
def baz():
pass\nawait foo()
""",
"""def foo():
def bar():
async def baz():
pass\nawait foo()
""",
"""async def foo(await):
pass
""",
"""def foo():
async def bar(): pass
await a
""",
"""def foo():
async def bar():
pass\nawait a
""",
"""def foo():
async for i in arange(2):
pass
""",
"""def foo():
async with resource:
pass
""",
"""async with resource:
pass
""",
"""async for i in arange(2):
pass
""",
]
for code in samples:
with self.subTest(code=code), self.assertRaises(SyntaxError):
compile(code, "<test>", "exec")
def test_badsyntax_2(self):
samples = [
"""def foo():
await = 1
""",
"""class Bar:
def async(): pass
""",
"""class Bar:
async = 1
""",
"""class async:
pass
""",
"""class await:
pass
""",
"""import math as await""",
"""def async():
pass""",
"""def foo(*, await=1):
pass"""
"""async = 1""",
"""print(await=1)"""
]
for code in samples:
with self.subTest(code=code), self.assertRaises(SyntaxError):
compile(code, "<test>", "exec")
def test_badsyntax_3(self):
with self.assertRaises(SyntaxError):
compile("async = 1", "<test>", "exec")
def test_badsyntax_4(self):
samples = [
'''def foo(await):
async def foo(): pass
async def foo():
pass
return await + 1
''',
'''def foo(await):
async def foo(): pass
async def foo(): pass
return await + 1
''',
'''def foo(await):
async def foo(): pass
async def foo(): pass
return await + 1
''',
'''def foo(await):
"""spam"""
async def foo(): \
pass
# 123
async def foo(): pass
# 456
return await + 1
''',
'''def foo(await):
def foo(): pass
def foo(): pass
async def bar(): return await_
await_ = await
try:
bar().send(None)
except StopIteration as ex:
return ex.args[0] + 1
'''
]
for code in samples:
with self.subTest(code=code), self.assertRaises(SyntaxError):
compile(code, "<test>", "exec")
class TokenizerRegrTest(unittest.TestCase):
def test_oneline_defs(self):
buf = []
for i in range(500):
buf.append('def i{i}(): return {i}'.format(i=i))
buf = '\n'.join(buf)
# Test that 500 consequent, one-line defs is OK
ns = {}
exec(buf, ns, ns)
self.assertEqual(ns['i499'](), 499)
# Test that 500 consequent, one-line defs *and*
# one 'async def' following them is OK
buf += '\nasync def foo():\n return'
ns = {}
exec(buf, ns, ns)
self.assertEqual(ns['i499'](), 499)
self.assertTrue(inspect.iscoroutinefunction(ns['foo']))
class CoroutineTest(unittest.TestCase):
def test_gen_1(self):
def gen(): yield
self.assertFalse(hasattr(gen, '__await__'))
def test_func_1(self):
async def foo():
return 10
f = foo()
self.assertIsInstance(f, types.CoroutineType)
self.assertTrue(bool(foo.__code__.co_flags & inspect.CO_COROUTINE))
self.assertFalse(bool(foo.__code__.co_flags & inspect.CO_GENERATOR))
self.assertTrue(bool(f.cr_code.co_flags & inspect.CO_COROUTINE))
self.assertFalse(bool(f.cr_code.co_flags & inspect.CO_GENERATOR))
self.assertEqual(run_async(f), ([], 10))
self.assertEqual(run_async__await__(foo()), ([], 10))
def bar(): pass
self.assertFalse(bool(bar.__code__.co_flags & inspect.CO_COROUTINE))
def test_func_2(self):
async def foo():
raise StopIteration
with self.assertRaisesRegex(
RuntimeError, "coroutine raised StopIteration"):
run_async(foo())
def test_func_3(self):
async def foo():
raise StopIteration
coro = foo()
self.assertRegex(repr(coro), '^<coroutine object.* at 0x.*>$')
coro.close()
def test_func_4(self):
async def foo():
raise StopIteration
coro = foo()
check = lambda: self.assertRaisesRegex(
TypeError, "'coroutine' object is not iterable")
with check():
list(coro)
with check():
tuple(coro)
with check():
sum(coro)
with check():
iter(coro)
with check():
for i in coro:
pass
with check():
[i for i in coro]
coro.close()
def test_func_5(self):
@types.coroutine
def bar():
yield 1
async def foo():
await bar()
check = lambda: self.assertRaisesRegex(
TypeError, "'coroutine' object is not iterable")
coro = foo()
with check():
for el in coro:
pass
coro.close()
# the following should pass without an error
for el in bar():
self.assertEqual(el, 1)
self.assertEqual([el for el in bar()], [1])
self.assertEqual(tuple(bar()), (1,))
self.assertEqual(next(iter(bar())), 1)
def test_func_6(self):
@types.coroutine
def bar():
yield 1
yield 2
async def foo():
await bar()
f = foo()
self.assertEqual(f.send(None), 1)
self.assertEqual(f.send(None), 2)
with self.assertRaises(StopIteration):
f.send(None)
def test_func_7(self):
async def bar():
return 10
coro = bar()
def foo():
yield from coro
with self.assertRaisesRegex(
TypeError,
"cannot 'yield from' a coroutine object in "
"a non-coroutine generator"):
list(foo())
coro.close()
def test_func_8(self):
@types.coroutine
def bar():
return (yield from coro)
async def foo():
return 'spam'
coro = foo()
self.assertEqual(run_async(bar()), ([], 'spam'))
coro.close()
def test_func_9(self):
async def foo():
pass
with self.assertWarnsRegex(
RuntimeWarning,
r"coroutine '.*test_func_9.*foo' was never awaited"):
foo()
support.gc_collect()
with self.assertWarnsRegex(
RuntimeWarning,
r"coroutine '.*test_func_9.*foo' was never awaited"):
with self.assertRaises(TypeError):
# See bpo-32703.
for _ in foo():
pass
support.gc_collect()
def test_func_10(self):
N = 0
@types.coroutine
def gen():
nonlocal N
try:
a = yield
yield (a ** 2)
except ZeroDivisionError:
N += 100
raise
finally:
N += 1
async def foo():
await gen()
coro = foo()
aw = coro.__await__()
self.assertIs(aw, iter(aw))
next(aw)
self.assertEqual(aw.send(10), 100)
self.assertEqual(N, 0)
aw.close()
self.assertEqual(N, 1)
coro = foo()
aw = coro.__await__()
next(aw)
with self.assertRaises(ZeroDivisionError):
aw.throw(ZeroDivisionError())
self.assertEqual(N, 102)
coro = foo()
aw = coro.__await__()
next(aw)
with self.assertRaises(ZeroDivisionError):
with self.assertWarns(DeprecationWarning):
aw.throw(ZeroDivisionError, ZeroDivisionError(), None)
def test_func_11(self):
async def func(): pass
coro = func()
# Test that PyCoro_Type and _PyCoroWrapper_Type types were properly
# initialized
self.assertIn('__await__', dir(coro))
self.assertIn('__iter__', dir(coro.__await__()))
self.assertIn('coroutine_wrapper', repr(coro.__await__()))
coro.close() # avoid RuntimeWarning
def test_func_12(self):
async def g():
i = me.send(None)
await foo
me = g()
with self.assertRaisesRegex(ValueError,
"coroutine already executing"):
me.send(None)
def test_func_13(self):
async def g():
pass
coro = g()
with self.assertRaisesRegex(
TypeError,
"can't send non-None value to a just-started coroutine"):
coro.send('spam')
coro.close()
def test_func_14(self):
@types.coroutine
def gen():
yield
async def coro():
try:
await gen()
except GeneratorExit:
await gen()
c = coro()
c.send(None)
with self.assertRaisesRegex(RuntimeError,
"coroutine ignored GeneratorExit"):
c.close()
def test_func_15(self):
# See http://bugs.python.org/issue25887 for details
async def spammer():
return 'spam'
async def reader(coro):
return await coro
spammer_coro = spammer()
with self.assertRaisesRegex(StopIteration, 'spam'):
reader(spammer_coro).send(None)
with self.assertRaisesRegex(RuntimeError,
'cannot reuse already awaited coroutine'):
reader(spammer_coro).send(None)
def test_func_16(self):
# See http://bugs.python.org/issue25887 for details
@types.coroutine
def nop():
yield
async def send():
await nop()
return 'spam'
async def read(coro):
await nop()
return await coro
spammer = send()
reader = read(spammer)
reader.send(None)
reader.send(None)
with self.assertRaisesRegex(Exception, 'ham'):
reader.throw(Exception('ham'))
reader = read(spammer)
reader.send(None)
with self.assertRaisesRegex(RuntimeError,
'cannot reuse already awaited coroutine'):
reader.send(None)
with self.assertRaisesRegex(RuntimeError,
'cannot reuse already awaited coroutine'):
reader.throw(Exception('wat'))
def test_func_17(self):
# See http://bugs.python.org/issue25887 for details
async def coroutine():
return 'spam'
coro = coroutine()
with self.assertRaisesRegex(StopIteration, 'spam'):
coro.send(None)
with self.assertRaisesRegex(RuntimeError,
'cannot reuse already awaited coroutine'):
coro.send(None)
with self.assertRaisesRegex(RuntimeError,
'cannot reuse already awaited coroutine'):
coro.throw(Exception('wat'))
# Closing a coroutine shouldn't raise any exception even if it's
# already closed/exhausted (similar to generators)
coro.close()
coro.close()
def test_func_18(self):
# See http://bugs.python.org/issue25887 for details
async def coroutine():
return 'spam'
coro = coroutine()
await_iter = coro.__await__()
it = iter(await_iter)
with self.assertRaisesRegex(StopIteration, 'spam'):
it.send(None)
with self.assertRaisesRegex(RuntimeError,
'cannot reuse already awaited coroutine'):
it.send(None)
with self.assertRaisesRegex(RuntimeError,
'cannot reuse already awaited coroutine'):
# Although the iterator protocol requires iterators to
# raise another StopIteration here, we don't want to do
# that. In this particular case, the iterator will raise
# a RuntimeError, so that 'yield from' and 'await'
# expressions will trigger the error, instead of silently
# ignoring the call.
next(it)
with self.assertRaisesRegex(RuntimeError,
'cannot reuse already awaited coroutine'):
it.throw(Exception('wat'))
with self.assertRaisesRegex(RuntimeError,
'cannot reuse already awaited coroutine'):
it.throw(Exception('wat'))
# Closing a coroutine shouldn't raise any exception even if it's
# already closed/exhausted (similar to generators)
it.close()
it.close()
def test_func_19(self):
CHK = 0
@types.coroutine
def foo():
nonlocal CHK
yield
try:
yield
except GeneratorExit:
CHK += 1
async def coroutine():
await foo()
coro = coroutine()
coro.send(None)
coro.send(None)
self.assertEqual(CHK, 0)
coro.close()
self.assertEqual(CHK, 1)
for _ in range(3):
# Closing a coroutine shouldn't raise any exception even if it's
# already closed/exhausted (similar to generators)
coro.close()
self.assertEqual(CHK, 1)
def test_coro_wrapper_send_tuple(self):
async def foo():
return (10,)
result = run_async__await__(foo())
self.assertEqual(result, ([], (10,)))
def test_coro_wrapper_send_stop_iterator(self):
async def foo():
return StopIteration(10)
result = run_async__await__(foo())
self.assertIsInstance(result[1], StopIteration)
self.assertEqual(result[1].value, 10)
def test_cr_await(self):
@types.coroutine
def a():
self.assertEqual(inspect.getcoroutinestate(coro_b), inspect.CORO_RUNNING)
self.assertIsNone(coro_b.cr_await)
yield
self.assertEqual(inspect.getcoroutinestate(coro_b), inspect.CORO_RUNNING)
self.assertIsNone(coro_b.cr_await)
async def c():
await a()
async def b():
self.assertIsNone(coro_b.cr_await)
await c()
self.assertIsNone(coro_b.cr_await)
coro_b = b()
self.assertEqual(inspect.getcoroutinestate(coro_b), inspect.CORO_CREATED)
self.assertIsNone(coro_b.cr_await)
coro_b.send(None)
self.assertEqual(inspect.getcoroutinestate(coro_b), inspect.CORO_SUSPENDED)
self.assertEqual(coro_b.cr_await.cr_await.gi_code.co_name, 'a')
with self.assertRaises(StopIteration):
coro_b.send(None) # complete coroutine
self.assertEqual(inspect.getcoroutinestate(coro_b), inspect.CORO_CLOSED)
self.assertIsNone(coro_b.cr_await)
def test_corotype_1(self):
ct = types.CoroutineType
if not support.MISSING_C_DOCSTRINGS:
self.assertIn('into coroutine', ct.send.__doc__)
self.assertIn('inside coroutine', ct.close.__doc__)
self.assertIn('in coroutine', ct.throw.__doc__)
self.assertIn('of the coroutine', ct.__dict__['__name__'].__doc__)
self.assertIn('of the coroutine', ct.__dict__['__qualname__'].__doc__)
self.assertEqual(ct.__name__, 'coroutine')
async def f(): pass
c = f()
self.assertIn('coroutine object', repr(c))
c.close()
def test_await_1(self):
async def foo():
await 1
with self.assertRaisesRegex(TypeError, "'int' object can.t be awaited"):
run_async(foo())
def test_await_2(self):
async def foo():
await []
with self.assertRaisesRegex(TypeError, "'list' object can.t be awaited"):
run_async(foo())
def test_await_3(self):
async def foo():
await AsyncYieldFrom([1, 2, 3])
self.assertEqual(run_async(foo()), ([1, 2, 3], None))
self.assertEqual(run_async__await__(foo()), ([1, 2, 3], None))
def test_await_4(self):
async def bar():
return 42
async def foo():
return await bar()
self.assertEqual(run_async(foo()), ([], 42))
def test_await_5(self):
class Awaitable:
def __await__(self):
return
async def foo():
return (await Awaitable())
with self.assertRaisesRegex(
TypeError, "__await__.*returned non-iterator of type"):
run_async(foo())
def test_await_6(self):
class Awaitable:
def __await__(self):
return iter([52])
async def foo():
return (await Awaitable())
self.assertEqual(run_async(foo()), ([52], None))
def test_await_7(self):
class Awaitable:
def __await__(self):
yield 42
return 100
async def foo():
return (await Awaitable())
self.assertEqual(run_async(foo()), ([42], 100))
def test_await_8(self):
class Awaitable:
pass
async def foo(): return await Awaitable()
with self.assertRaisesRegex(
TypeError, "'Awaitable' object can't be awaited"):
run_async(foo())
def test_await_9(self):
def wrap():
return bar
async def bar():
return 42
async def foo():
db = {'b': lambda: wrap}
class DB:
b = wrap
return (await bar() + await wrap()() + await db['b']()()() +
await bar() * 1000 + await DB.b()())
async def foo2():
return -await bar()
self.assertEqual(run_async(foo()), ([], 42168))
self.assertEqual(run_async(foo2()), ([], -42))
def test_await_10(self):
async def baz():
return 42
async def bar():
return baz()
async def foo():
return await (await bar())
self.assertEqual(run_async(foo()), ([], 42))
def test_await_11(self):
def ident(val):
return val
async def bar():
return 'spam'
async def foo():
return ident(val=await bar())
async def foo2():
return await bar(), 'ham'
self.assertEqual(run_async(foo2()), ([], ('spam', 'ham')))
def test_await_12(self):
async def coro():
return 'spam'
c = coro()
class Awaitable:
def __await__(self):
return c
async def foo():
return await Awaitable()
with self.assertRaisesRegex(
TypeError, r"__await__\(\) returned a coroutine"):
run_async(foo())
c.close()
def test_await_13(self):
class Awaitable:
def __await__(self):
return self
async def foo():
return await Awaitable()
with self.assertRaisesRegex(
TypeError, "__await__.*returned non-iterator of type"):
run_async(foo())
def test_await_14(self):
class Wrapper:
# Forces the interpreter to use CoroutineType.__await__
def __init__(self, coro):
assert coro.__class__ is types.CoroutineType
self.coro = coro
def __await__(self):
return self.coro.__await__()
class FutureLike:
def __await__(self):
return (yield)
class Marker(Exception):
pass
async def coro1():
try:
return await FutureLike()
except ZeroDivisionError:
raise Marker
async def coro2():
return await Wrapper(coro1())
c = coro2()
c.send(None)
with self.assertRaisesRegex(StopIteration, 'spam'):
c.send('spam')
c = coro2()
c.send(None)
with self.assertRaises(Marker):
c.throw(ZeroDivisionError)
def test_await_15(self):
@types.coroutine
def nop():
yield
async def coroutine():
await nop()
async def waiter(coro):
await coro
coro = coroutine()
coro.send(None)
with self.assertRaisesRegex(RuntimeError,
"coroutine is being awaited already"):
waiter(coro).send(None)
def test_await_16(self):
# See https://bugs.python.org/issue29600 for details.
async def f():
return ValueError()
async def g():
try:
raise KeyError
except:
return await f()
_, result = run_async(g())
self.assertIsNone(result.__context__)
def test_with_1(self):
class Manager:
def __init__(self, name):
self.name = name
async def __aenter__(self):
await AsyncYieldFrom(['enter-1-' + self.name,
'enter-2-' + self.name])
return self
async def __aexit__(self, *args):
await AsyncYieldFrom(['exit-1-' + self.name,
'exit-2-' + self.name])
if self.name == 'B':
return True
async def foo():
async with Manager("A") as a, Manager("B") as b:
await AsyncYieldFrom([('managers', a.name, b.name)])
1/0
f = foo()
result, _ = run_async(f)
self.assertEqual(
result, ['enter-1-A', 'enter-2-A', 'enter-1-B', 'enter-2-B',
('managers', 'A', 'B'),
'exit-1-B', 'exit-2-B', 'exit-1-A', 'exit-2-A']
)
async def foo():
async with Manager("A") as a, Manager("C") as c:
await AsyncYieldFrom([('managers', a.name, c.name)])
1/0
with self.assertRaises(ZeroDivisionError):
run_async(foo())
def test_with_2(self):
class CM:
def __aenter__(self):
pass
body_executed = None
async def foo():
nonlocal body_executed
body_executed = False
async with CM():
body_executed = True
with self.assertRaisesRegex(TypeError, 'asynchronous context manager.*__aexit__'):
run_async(foo())
self.assertIs(body_executed, False)
def test_with_3(self):
class CM:
def __aexit__(self):
pass
body_executed = None
async def foo():
nonlocal body_executed
body_executed = False
async with CM():
body_executed = True
with self.assertRaisesRegex(TypeError, 'asynchronous context manager'):
run_async(foo())
self.assertIs(body_executed, False)
def test_with_4(self):
class CM:
pass
body_executed = None
async def foo():
nonlocal body_executed
body_executed = False
async with CM():
body_executed = True
with self.assertRaisesRegex(TypeError, 'asynchronous context manager'):
run_async(foo())
self.assertIs(body_executed, False)
def test_with_5(self):
# While this test doesn't make a lot of sense,
# it's a regression test for an early bug with opcodes
# generation
class CM:
async def __aenter__(self):
return self
async def __aexit__(self, *exc):
pass
async def func():
async with CM():
self.assertEqual((1, ), 1)
with self.assertRaises(AssertionError):
run_async(func())
def test_with_6(self):
class CM:
def __aenter__(self):
return 123
def __aexit__(self, *e):
return 456
async def foo():
async with CM():
pass
with self.assertRaisesRegex(
TypeError,
"'async with' received an object from __aenter__ "
"that does not implement __await__: int"):
# it's important that __aexit__ wasn't called
run_async(foo())
def test_with_7(self):
class CM:
async def __aenter__(self):
return self
def __aexit__(self, *e):
return 444
# Exit with exception
async def foo():
async with CM():
1/0
try:
run_async(foo())
except TypeError as exc:
self.assertRegex(
exc.args[0],
"'async with' received an object from __aexit__ "
"that does not implement __await__: int")
self.assertTrue(exc.__context__ is not None)
self.assertTrue(isinstance(exc.__context__, ZeroDivisionError))
else:
self.fail('invalid asynchronous context manager did not fail')
def test_with_8(self):
CNT = 0
class CM:
async def __aenter__(self):
return self
def __aexit__(self, *e):
return 456
# Normal exit
async def foo():
nonlocal CNT
async with CM():
CNT += 1
with self.assertRaisesRegex(
TypeError,
"'async with' received an object from __aexit__ "
"that does not implement __await__: int"):
run_async(foo())
self.assertEqual(CNT, 1)
# Exit with 'break'
async def foo():
nonlocal CNT
for i in range(2):
async with CM():
CNT += 1
break
with self.assertRaisesRegex(
TypeError,
"'async with' received an object from __aexit__ "
"that does not implement __await__: int"):
run_async(foo())
self.assertEqual(CNT, 2)
# Exit with 'continue'
async def foo():
nonlocal CNT
for i in range(2):
async with CM():
CNT += 1
continue
with self.assertRaisesRegex(
TypeError,
"'async with' received an object from __aexit__ "
"that does not implement __await__: int"):
run_async(foo())
self.assertEqual(CNT, 3)
# Exit with 'return'
async def foo():
nonlocal CNT
async with CM():
CNT += 1
return
with self.assertRaisesRegex(
TypeError,
"'async with' received an object from __aexit__ "
"that does not implement __await__: int"):
run_async(foo())
self.assertEqual(CNT, 4)
def test_with_9(self):
CNT = 0
class CM:
async def __aenter__(self):
return self
async def __aexit__(self, *e):
1/0
async def foo():
nonlocal CNT
async with CM():
CNT += 1
with self.assertRaises(ZeroDivisionError):
run_async(foo())
self.assertEqual(CNT, 1)
def test_with_10(self):
CNT = 0
class CM:
async def __aenter__(self):
return self
async def __aexit__(self, *e):
1/0
async def foo():
nonlocal CNT
async with CM():
async with CM():
raise RuntimeError
try:
run_async(foo())
except ZeroDivisionError as exc:
self.assertTrue(exc.__context__ is not None)
self.assertTrue(isinstance(exc.__context__, ZeroDivisionError))
self.assertTrue(isinstance(exc.__context__.__context__,
RuntimeError))
else:
self.fail('exception from __aexit__ did not propagate')
def test_with_11(self):
CNT = 0
class CM:
async def __aenter__(self):
raise NotImplementedError
async def __aexit__(self, *e):
1/0
async def foo():
nonlocal CNT
async with CM():
raise RuntimeError
try:
run_async(foo())
except NotImplementedError as exc:
self.assertTrue(exc.__context__ is None)
else:
self.fail('exception from __aenter__ did not propagate')
def test_with_12(self):
CNT = 0
class CM:
async def __aenter__(self):
return self
async def __aexit__(self, *e):
return True
async def foo():
nonlocal CNT
async with CM() as cm:
self.assertIs(cm.__class__, CM)
raise RuntimeError
run_async(foo())
def test_with_13(self):
CNT = 0
class CM:
async def __aenter__(self):
1/0
async def __aexit__(self, *e):
return True
async def foo():
nonlocal CNT
CNT += 1
async with CM():
CNT += 1000
CNT += 10000
with self.assertRaises(ZeroDivisionError):
run_async(foo())
self.assertEqual(CNT, 1)
def test_for_1(self):
aiter_calls = 0
class AsyncIter:
def __init__(self):
self.i = 0
def __aiter__(self):
nonlocal aiter_calls
aiter_calls += 1
return self
async def __anext__(self):
self.i += 1
if not (self.i % 10):
await AsyncYield(self.i * 10)
if self.i > 100:
raise StopAsyncIteration
return self.i, self.i
buffer = []
async def test1():
async for i1, i2 in AsyncIter():
buffer.append(i1 + i2)
yielded, _ = run_async(test1())
# Make sure that __aiter__ was called only once
self.assertEqual(aiter_calls, 1)
self.assertEqual(yielded, [i * 100 for i in range(1, 11)])
self.assertEqual(buffer, [i*2 for i in range(1, 101)])
buffer = []
async def test2():
nonlocal buffer
async for i in AsyncIter():
buffer.append(i[0])
if i[0] == 20:
break
else:
buffer.append('what?')
buffer.append('end')
yielded, _ = run_async(test2())
# Make sure that __aiter__ was called only once
self.assertEqual(aiter_calls, 2)
self.assertEqual(yielded, [100, 200])
self.assertEqual(buffer, [i for i in range(1, 21)] + ['end'])
buffer = []
async def test3():
nonlocal buffer
async for i in AsyncIter():
if i[0] > 20:
continue
buffer.append(i[0])
else:
buffer.append('what?')
buffer.append('end')
yielded, _ = run_async(test3())
# Make sure that __aiter__ was called only once
self.assertEqual(aiter_calls, 3)
self.assertEqual(yielded, [i * 100 for i in range(1, 11)])
self.assertEqual(buffer, [i for i in range(1, 21)] +
['what?', 'end'])
def test_for_2(self):
tup = (1, 2, 3)
refs_before = sys.getrefcount(tup)
async def foo():
async for i in tup:
print('never going to happen')
with self.assertRaisesRegex(
TypeError, "async for' requires an object.*__aiter__.*tuple"):
run_async(foo())
self.assertEqual(sys.getrefcount(tup), refs_before)
def test_for_3(self):
class I:
def __aiter__(self):
return self
aiter = I()
refs_before = sys.getrefcount(aiter)
async def foo():
async for i in aiter:
print('never going to happen')
with self.assertRaisesRegex(
TypeError,
r"that does not implement __anext__"):
run_async(foo())
self.assertEqual(sys.getrefcount(aiter), refs_before)
def test_for_4(self):
class I:
def __aiter__(self):
return self
def __anext__(self):
return ()
aiter = I()
refs_before = sys.getrefcount(aiter)
async def foo():
async for i in aiter:
print('never going to happen')
with self.assertRaisesRegex(
TypeError,
"async for' received an invalid object.*__anext__.*tuple"):
run_async(foo())
self.assertEqual(sys.getrefcount(aiter), refs_before)
def test_for_6(self):
I = 0
class Manager:
async def __aenter__(self):
nonlocal I
I += 10000
async def __aexit__(self, *args):
nonlocal I
I += 100000
class Iterable:
def __init__(self):
self.i = 0
def __aiter__(self):
return self
async def __anext__(self):
if self.i > 10:
raise StopAsyncIteration
self.i += 1
return self.i
##############
manager = Manager()
iterable = Iterable()
mrefs_before = sys.getrefcount(manager)
irefs_before = sys.getrefcount(iterable)
async def main():
nonlocal I
async with manager:
async for i in iterable:
I += 1
I += 1000
with warnings.catch_warnings():
warnings.simplefilter("error")
# Test that __aiter__ that returns an asynchronous iterator
# directly does not throw any warnings.
run_async(main())
self.assertEqual(I, 111011)
self.assertEqual(sys.getrefcount(manager), mrefs_before)
self.assertEqual(sys.getrefcount(iterable), irefs_before)
##############
async def main():
nonlocal I
async with Manager():
async for i in Iterable():
I += 1
I += 1000
async with Manager():
async for i in Iterable():
I += 1
I += 1000
run_async(main())
self.assertEqual(I, 333033)
##############
async def main():
nonlocal I
async with Manager():
I += 100
async for i in Iterable():
I += 1
else:
I += 10000000
I += 1000
async with Manager():
I += 100
async for i in Iterable():
I += 1
else:
I += 10000000
I += 1000
run_async(main())
self.assertEqual(I, 20555255)
def test_for_7(self):
CNT = 0
class AI:
def __aiter__(self):
1/0
async def foo():
nonlocal CNT
async for i in AI():
CNT += 1
CNT += 10
with self.assertRaises(ZeroDivisionError):
run_async(foo())
self.assertEqual(CNT, 0)
def test_for_8(self):
CNT = 0
class AI:
def __aiter__(self):
1/0
async def foo():
nonlocal CNT
async for i in AI():
CNT += 1
CNT += 10
with self.assertRaises(ZeroDivisionError):
with warnings.catch_warnings():
warnings.simplefilter("error")
# Test that if __aiter__ raises an exception it propagates
# without any kind of warning.
run_async(foo())
self.assertEqual(CNT, 0)
def test_for_11(self):
class F:
def __aiter__(self):
return self
def __anext__(self):
return self
def __await__(self):
1 / 0
async def main():
async for _ in F():
pass
with self.assertRaisesRegex(TypeError,
'an invalid object from __anext__') as c:
main().send(None)
err = c.exception
self.assertIsInstance(err.__cause__, ZeroDivisionError)
def test_for_tuple(self):
class Done(Exception): pass
class AIter(tuple):
i = 0
def __aiter__(self):
return self
async def __anext__(self):
if self.i >= len(self):
raise StopAsyncIteration
self.i += 1
return self[self.i - 1]
result = []
async def foo():
async for i in AIter([42]):
result.append(i)
raise Done
with self.assertRaises(Done):
foo().send(None)
self.assertEqual(result, [42])
def test_for_stop_iteration(self):
class Done(Exception): pass
class AIter(StopIteration):
i = 0
def __aiter__(self):
return self
async def __anext__(self):
if self.i:
raise StopAsyncIteration
self.i += 1
return self.value
result = []
async def foo():
async for i in AIter(42):
result.append(i)
raise Done
with self.assertRaises(Done):
foo().send(None)
self.assertEqual(result, [42])
def test_comp_1(self):
async def f(i):
return i
async def run_list():
return [await c for c in [f(1), f(41)]]
async def run_set():
return {await c for c in [f(1), f(41)]}
async def run_dict1():
return {await c: 'a' for c in [f(1), f(41)]}
async def run_dict2():
return {i: await c for i, c in enumerate([f(1), f(41)])}
self.assertEqual(run_async(run_list()), ([], [1, 41]))
self.assertEqual(run_async(run_set()), ([], {1, 41}))
self.assertEqual(run_async(run_dict1()), ([], {1: 'a', 41: 'a'}))
self.assertEqual(run_async(run_dict2()), ([], {0: 1, 1: 41}))
def test_comp_2(self):
async def f(i):
return i
async def run_list():
return [s for c in [f(''), f('abc'), f(''), f(['de', 'fg'])]
for s in await c]
self.assertEqual(
run_async(run_list()),
([], ['a', 'b', 'c', 'de', 'fg']))
async def run_set():
return {d
for c in [f([f([10, 30]),
f([20])])]
for s in await c
for d in await s}
self.assertEqual(
run_async(run_set()),
([], {10, 20, 30}))
async def run_set2():
return {await s
for c in [f([f(10), f(20)])]
for s in await c}
self.assertEqual(
run_async(run_set2()),
([], {10, 20}))
def test_comp_3(self):
async def f(it):
for i in it:
yield i
async def run_list():
return [i + 1 async for i in f([10, 20])]
self.assertEqual(
run_async(run_list()),
([], [11, 21]))
async def run_set():
return {i + 1 async for i in f([10, 20])}
self.assertEqual(
run_async(run_set()),
([], {11, 21}))
async def run_dict():
return {i + 1: i + 2 async for i in f([10, 20])}
self.assertEqual(
run_async(run_dict()),
([], {11: 12, 21: 22}))
async def run_gen():
gen = (i + 1 async for i in f([10, 20]))
return [g + 100 async for g in gen]
self.assertEqual(
run_async(run_gen()),
([], [111, 121]))
def test_comp_4(self):
async def f(it):
for i in it:
yield i
async def run_list():
return [i + 1 async for i in f([10, 20]) if i > 10]
self.assertEqual(
run_async(run_list()),
([], [21]))
async def run_set():
return {i + 1 async for i in f([10, 20]) if i > 10}
self.assertEqual(
run_async(run_set()),
([], {21}))
async def run_dict():
return {i + 1: i + 2 async for i in f([10, 20]) if i > 10}
self.assertEqual(
run_async(run_dict()),
([], {21: 22}))
async def run_gen():
gen = (i + 1 async for i in f([10, 20]) if i > 10)
return [g + 100 async for g in gen]
self.assertEqual(
run_async(run_gen()),
([], [121]))
def test_comp_4_2(self):
async def f(it):
for i in it:
yield i
async def run_list():
return [i + 10 async for i in f(range(5)) if 0 < i < 4]
self.assertEqual(
run_async(run_list()),
([], [11, 12, 13]))
async def run_set():
return {i + 10 async for i in f(range(5)) if 0 < i < 4}
self.assertEqual(
run_async(run_set()),
([], {11, 12, 13}))
async def run_dict():
return {i + 10: i + 100 async for i in f(range(5)) if 0 < i < 4}
self.assertEqual(
run_async(run_dict()),
([], {11: 101, 12: 102, 13: 103}))
async def run_gen():
gen = (i + 10 async for i in f(range(5)) if 0 < i < 4)
return [g + 100 async for g in gen]
self.assertEqual(
run_async(run_gen()),
([], [111, 112, 113]))
def test_comp_5(self):
async def f(it):
for i in it:
yield i
async def run_list():
return [i + 1 for pair in ([10, 20], [30, 40]) if pair[0] > 10
async for i in f(pair) if i > 30]
self.assertEqual(
run_async(run_list()),
([], [41]))
def test_comp_6(self):
async def f(it):
for i in it:
yield i
async def run_list():
return [i + 1 async for seq in f([(10, 20), (30,)])
for i in seq]
self.assertEqual(
run_async(run_list()),
([], [11, 21, 31]))
def test_comp_7(self):
async def f():
yield 1
yield 2
raise Exception('aaa')
async def run_list():
return [i async for i in f()]
with self.assertRaisesRegex(Exception, 'aaa'):
run_async(run_list())
def test_comp_8(self):
async def f():
return [i for i in [1, 2, 3]]
self.assertEqual(
run_async(f()),
([], [1, 2, 3]))
def test_comp_9(self):
async def gen():
yield 1
yield 2
async def f():
l = [i async for i in gen()]
return [i for i in l]
self.assertEqual(
run_async(f()),
([], [1, 2]))
def test_comp_10(self):
async def f():
xx = {i for i in [1, 2, 3]}
return {x: x for x in xx}
self.assertEqual(
run_async(f()),
([], {1: 1, 2: 2, 3: 3}))
def test_nested_comp(self):
async def run_list_inside_list():
return [[i + j async for i in asynciter([1, 2])] for j in [10, 20]]
self.assertEqual(
run_async(run_list_inside_list()),
([], [[11, 12], [21, 22]]))
async def run_set_inside_list():
return [{i + j async for i in asynciter([1, 2])} for j in [10, 20]]
self.assertEqual(
run_async(run_set_inside_list()),
([], [{11, 12}, {21, 22}]))
async def run_list_inside_set():
return {sum([i async for i in asynciter(range(j))]) for j in [3, 5]}
self.assertEqual(
run_async(run_list_inside_set()),
([], {3, 10}))
async def run_dict_inside_dict():
return {j: {i: i + j async for i in asynciter([1, 2])} for j in [10, 20]}
self.assertEqual(
run_async(run_dict_inside_dict()),
([], {10: {1: 11, 2: 12}, 20: {1: 21, 2: 22}}))
async def run_list_inside_gen():
gen = ([i + j async for i in asynciter([1, 2])] for j in [10, 20])
return [x async for x in gen]
self.assertEqual(
run_async(run_list_inside_gen()),
([], [[11, 12], [21, 22]]))
async def run_gen_inside_list():
gens = [(i async for i in asynciter(range(j))) for j in [3, 5]]
return [x for g in gens async for x in g]
self.assertEqual(
run_async(run_gen_inside_list()),
([], [0, 1, 2, 0, 1, 2, 3, 4]))
async def run_gen_inside_gen():
gens = ((i async for i in asynciter(range(j))) for j in [3, 5])
return [x for g in gens async for x in g]
self.assertEqual(
run_async(run_gen_inside_gen()),
([], [0, 1, 2, 0, 1, 2, 3, 4]))
async def run_list_inside_list_inside_list():
return [[[i + j + k async for i in asynciter([1, 2])]
for j in [10, 20]]
for k in [100, 200]]
self.assertEqual(
run_async(run_list_inside_list_inside_list()),
([], [[[111, 112], [121, 122]], [[211, 212], [221, 222]]]))
def test_copy(self):
async def func(): pass
coro = func()
with self.assertRaises(TypeError):
copy.copy(coro)
aw = coro.__await__()
try:
with self.assertRaises(TypeError):
copy.copy(aw)
finally:
aw.close()
def test_pickle(self):
async def func(): pass
coro = func()
for proto in range(pickle.HIGHEST_PROTOCOL + 1):
with self.assertRaises((TypeError, pickle.PicklingError)):
pickle.dumps(coro, proto)
aw = coro.__await__()
try:
for proto in range(pickle.HIGHEST_PROTOCOL + 1):
with self.assertRaises((TypeError, pickle.PicklingError)):
pickle.dumps(aw, proto)
finally:
aw.close()
def test_fatal_coro_warning(self):
# Issue 27811
async def func(): pass
with warnings.catch_warnings(), \
support.catch_unraisable_exception() as cm:
warnings.filterwarnings("error")
coro = func()
# only store repr() to avoid keeping the coroutine alive
coro_repr = repr(coro)
coro = None
support.gc_collect()
self.assertIn("was never awaited", str(cm.unraisable.exc_value))
self.assertEqual(repr(cm.unraisable.object), coro_repr)
def test_for_assign_raising_stop_async_iteration(self):
class BadTarget:
def __setitem__(self, key, value):
raise StopAsyncIteration(42)
tgt = BadTarget()
async def source():
yield 10
async def run_for():
with self.assertRaises(StopAsyncIteration) as cm:
async for tgt[0] in source():
pass
self.assertEqual(cm.exception.args, (42,))
return 'end'
self.assertEqual(run_async(run_for()), ([], 'end'))
async def run_list():
with self.assertRaises(StopAsyncIteration) as cm:
return [0 async for tgt[0] in source()]
self.assertEqual(cm.exception.args, (42,))
return 'end'
self.assertEqual(run_async(run_list()), ([], 'end'))
async def run_gen():
gen = (0 async for tgt[0] in source())
a = gen.asend(None)
with self.assertRaises(RuntimeError) as cm:
await a
self.assertIsInstance(cm.exception.__cause__, StopAsyncIteration)
self.assertEqual(cm.exception.__cause__.args, (42,))
return 'end'
self.assertEqual(run_async(run_gen()), ([], 'end'))
def test_for_assign_raising_stop_async_iteration_2(self):
class BadIterable:
def __iter__(self):
raise StopAsyncIteration(42)
async def badpairs():
yield BadIterable()
async def run_for():
with self.assertRaises(StopAsyncIteration) as cm:
async for i, j in badpairs():
pass
self.assertEqual(cm.exception.args, (42,))
return 'end'
self.assertEqual(run_async(run_for()), ([], 'end'))
async def run_list():
with self.assertRaises(StopAsyncIteration) as cm:
return [0 async for i, j in badpairs()]
self.assertEqual(cm.exception.args, (42,))
return 'end'
self.assertEqual(run_async(run_list()), ([], 'end'))
async def run_gen():
gen = (0 async for i, j in badpairs())
a = gen.asend(None)
with self.assertRaises(RuntimeError) as cm:
await a
self.assertIsInstance(cm.exception.__cause__, StopAsyncIteration)
self.assertEqual(cm.exception.__cause__.args, (42,))
return 'end'
self.assertEqual(run_async(run_gen()), ([], 'end'))
def test_bpo_45813_1(self):
'This would crash the interpreter in 3.11a2'
async def f():
pass
with self.assertWarns(RuntimeWarning):
frame = f().cr_frame
frame.clear()
def test_bpo_45813_2(self):
'This would crash the interpreter in 3.11a2'
async def f():
pass
gen = f()
with self.assertWarns(RuntimeWarning):
gen.cr_frame.clear()
gen.close()
def test_cr_frame_after_close(self):
async def f():
pass
gen = f()
self.assertIsNotNone(gen.cr_frame)
gen.close()
self.assertIsNone(gen.cr_frame)
def test_stack_in_coroutine_throw(self):
# Regression test for https://github.com/python/cpython/issues/93592
async def a():
return await b()
async def b():
return await c()
@types.coroutine
def c():
try:
# traceback.print_stack()
yield len(traceback.extract_stack())
except ZeroDivisionError:
# traceback.print_stack()
yield len(traceback.extract_stack())
coro = a()
len_send = coro.send(None)
len_throw = coro.throw(ZeroDivisionError)
# before fixing, visible stack from throw would be shorter than from send.
self.assertEqual(len_send, len_throw)
@unittest.skipIf(
support.is_emscripten or support.is_wasi,
"asyncio does not work under Emscripten/WASI yet."
)
class CoroAsyncIOCompatTest(unittest.TestCase):
def test_asyncio_1(self):
# asyncio cannot be imported when Python is compiled without thread
# support
asyncio = import_helper.import_module('asyncio')
class MyException(Exception):
pass
buffer = []
class CM:
async def __aenter__(self):
buffer.append(1)
await asyncio.sleep(0.01)
buffer.append(2)
return self
async def __aexit__(self, exc_type, exc_val, exc_tb):
await asyncio.sleep(0.01)
buffer.append(exc_type.__name__)
async def f():
async with CM() as c:
await asyncio.sleep(0.01)
raise MyException
buffer.append('unreachable')
loop = asyncio.new_event_loop()
asyncio.set_event_loop(loop)
try:
loop.run_until_complete(f())
except MyException:
pass
finally:
loop.close()
asyncio.set_event_loop_policy(None)
self.assertEqual(buffer, [1, 2, 'MyException'])
class OriginTrackingTest(unittest.TestCase):
def here(self):
info = inspect.getframeinfo(inspect.currentframe().f_back)
return (info.filename, info.lineno)
def test_origin_tracking(self):
orig_depth = sys.get_coroutine_origin_tracking_depth()
try:
async def corofn():
pass
sys.set_coroutine_origin_tracking_depth(0)
self.assertEqual(sys.get_coroutine_origin_tracking_depth(), 0)
with contextlib.closing(corofn()) as coro:
self.assertIsNone(coro.cr_origin)
sys.set_coroutine_origin_tracking_depth(1)
self.assertEqual(sys.get_coroutine_origin_tracking_depth(), 1)
fname, lineno = self.here()
with contextlib.closing(corofn()) as coro:
self.assertEqual(coro.cr_origin,
((fname, lineno + 1, "test_origin_tracking"),))
sys.set_coroutine_origin_tracking_depth(2)
self.assertEqual(sys.get_coroutine_origin_tracking_depth(), 2)
def nested():
return (self.here(), corofn())
fname, lineno = self.here()
((nested_fname, nested_lineno), coro) = nested()
with contextlib.closing(coro):
self.assertEqual(coro.cr_origin,
((nested_fname, nested_lineno, "nested"),
(fname, lineno + 1, "test_origin_tracking")))
# Check we handle running out of frames correctly
sys.set_coroutine_origin_tracking_depth(1000)
with contextlib.closing(corofn()) as coro:
self.assertTrue(2 < len(coro.cr_origin) < 1000)
# We can't set depth negative
with self.assertRaises(ValueError):
sys.set_coroutine_origin_tracking_depth(-1)
# And trying leaves it unchanged
self.assertEqual(sys.get_coroutine_origin_tracking_depth(), 1000)
finally:
sys.set_coroutine_origin_tracking_depth(orig_depth)
def test_origin_tracking_warning(self):
async def corofn():
pass
a1_filename, a1_lineno = self.here()
def a1():
return corofn() # comment in a1
a1_lineno += 2
a2_filename, a2_lineno = self.here()
def a2():
return a1() # comment in a2
a2_lineno += 2
def check(depth, msg):
sys.set_coroutine_origin_tracking_depth(depth)
with self.assertWarns(RuntimeWarning) as cm:
a2()
support.gc_collect()
self.assertEqual(msg, str(cm.warning))
orig_depth = sys.get_coroutine_origin_tracking_depth()
try:
msg = check(0, f"coroutine '{corofn.__qualname__}' was never awaited")
check(1, "".join([
f"coroutine '{corofn.__qualname__}' was never awaited\n",
"Coroutine created at (most recent call last)\n",
f' File "{a1_filename}", line {a1_lineno}, in a1\n',
" return corofn() # comment in a1",
]))
check(2, "".join([
f"coroutine '{corofn.__qualname__}' was never awaited\n",
"Coroutine created at (most recent call last)\n",
f' File "{a2_filename}", line {a2_lineno}, in a2\n',
" return a1() # comment in a2\n",
f' File "{a1_filename}", line {a1_lineno}, in a1\n',
" return corofn() # comment in a1",
]))
finally:
sys.set_coroutine_origin_tracking_depth(orig_depth)
def test_unawaited_warning_when_module_broken(self):
# Make sure we don't blow up too bad if
# warnings._warn_unawaited_coroutine is broken somehow (e.g. because
# of shutdown problems)
async def corofn():
pass
orig_wuc = warnings._warn_unawaited_coroutine
try:
warnings._warn_unawaited_coroutine = lambda coro: 1/0
with support.catch_unraisable_exception() as cm, \
warnings_helper.check_warnings(
(r'coroutine .* was never awaited',
RuntimeWarning)):
# only store repr() to avoid keeping the coroutine alive
coro = corofn()
coro_repr = repr(coro)
# clear reference to the coroutine without awaiting for it
del coro
support.gc_collect()
self.assertEqual(repr(cm.unraisable.object), coro_repr)
self.assertEqual(cm.unraisable.exc_type, ZeroDivisionError)
del warnings._warn_unawaited_coroutine
with warnings_helper.check_warnings(
(r'coroutine .* was never awaited', RuntimeWarning)):
corofn()
support.gc_collect()
finally:
warnings._warn_unawaited_coroutine = orig_wuc
class UnawaitedWarningDuringShutdownTest(unittest.TestCase):
# https://bugs.python.org/issue32591#msg310726
def test_unawaited_warning_during_shutdown(self):
code = ("import asyncio\n"
"async def f(): pass\n"
"async def t(): asyncio.gather(f())\n"
"asyncio.run(t())\n")
assert_python_ok("-c", code)
code = ("import sys\n"
"async def f(): pass\n"
"sys.coro = f()\n")
assert_python_ok("-c", code)
code = ("import sys\n"
"async def f(): pass\n"
"sys.corocycle = [f()]\n"
"sys.corocycle.append(sys.corocycle)\n")
assert_python_ok("-c", code)
@support.cpython_only
@unittest.skipIf(_testcapi is None, "requires _testcapi")
class CAPITest(unittest.TestCase):
def test_tp_await_1(self):
from _testcapi import awaitType as at
async def foo():
future = at(iter([1]))
return (await future)
self.assertEqual(foo().send(None), 1)
def test_tp_await_2(self):
# Test tp_await to __await__ mapping
from _testcapi import awaitType as at
future = at(iter([1]))
self.assertEqual(next(future.__await__()), 1)
def test_tp_await_3(self):
from _testcapi import awaitType as at
async def foo():
future = at(1)
return (await future)
with self.assertRaisesRegex(
TypeError, "__await__.*returned non-iterator of type 'int'"):
self.assertEqual(foo().send(None), 1)
if __name__=="__main__":
unittest.main()