import contextlib import copy import inspect import pickle import sys import types import unittest import warnings from test import support 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 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): with self.assertRaisesRegex(SyntaxError, "'await' outside"): import test.badsyntax_async1 def test_badsyntax_2(self): with self.assertRaisesRegex(SyntaxError, "'await' outside"): import test.badsyntax_async2 def test_badsyntax_3(self): with self.assertRaisesRegex(SyntaxError, 'invalid syntax'): import test.badsyntax_async3 def test_badsyntax_4(self): with self.assertRaisesRegex(SyntaxError, 'invalid syntax'): import test.badsyntax_async4 def test_badsyntax_5(self): with self.assertRaisesRegex(SyntaxError, 'invalid syntax'): import test.badsyntax_async5 def test_badsyntax_6(self): with self.assertRaisesRegex( SyntaxError, "'yield' inside async function"): import test.badsyntax_async6 def test_badsyntax_7(self): with self.assertRaisesRegex( SyntaxError, "'yield from' inside async function"): import test.badsyntax_async7 def test_badsyntax_8(self): with self.assertRaisesRegex(SyntaxError, 'invalid syntax'): import test.badsyntax_async8 def test_badsyntax_9(self): ns = {} for comp in {'(await a for a in b)', '[await a for a in b]', '{await a for a in b}', '{await a: c for a in b}'}: with self.assertRaisesRegex(SyntaxError, 'await.*in comprehen'): exec('async def f():\n\t{}'.format(comp), ns, ns) def test_badsyntax_10(self): # Tests for issue 24619 samples = [ """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 """] for code in samples: with self.subTest(code=code), self.assertRaises(SyntaxError): compile(code, "", "exec") def test_goodsyntax_1(self): # Tests for issue 24619 def foo(await): async def foo(): pass async def foo(): pass return await + 1 self.assertEqual(foo(10), 11) def foo(await): async def foo(): pass async def foo(): pass return await + 2 self.assertEqual(foo(20), 22) def foo(await): async def foo(): pass async def foo(): pass return await + 2 self.assertEqual(foo(20), 22) def foo(await): """spam""" async def foo(): \ pass # 123 async def foo(): pass # 456 return await + 2 self.assertEqual(foo(20), 22) 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] self.assertEqual(foo(42), 42) async def f(): async def g(): pass await z await = 1 self.assertTrue(inspect.iscoroutinefunction(f)) 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 with silence_coro_gc(): self.assertRegex(repr(foo()), '^$') def test_func_4(self): async def foo(): raise StopIteration check = lambda: self.assertRaisesRegex( TypeError, "'coroutine' object is not iterable") with check(): list(foo()) with check(): tuple(foo()) with check(): sum(foo()) with check(): iter(foo()) with silence_coro_gc(), check(): for i in foo(): pass with silence_coro_gc(), check(): [i for i in foo()] 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") with check(): for el in foo(): pass # 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 def foo(): yield from bar() with silence_coro_gc(), self.assertRaisesRegex( TypeError, "cannot 'yield from' a coroutine object in a non-coroutine generator"): list(foo()) def test_func_8(self): @types.coroutine def bar(): return (yield from foo()) async def foo(): return 'spam' self.assertEqual(run_async(bar()), ([], 'spam') ) def test_func_9(self): async def foo(): pass with self.assertWarnsRegex( RuntimeWarning, "coroutine '.*test_func_9.*foo' was never awaited"): foo() 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, None, None) self.assertEqual(N, 102) 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 with self.assertRaisesRegex( TypeError, "can't send non-None value to a just-started coroutine"): g().send('spam') 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_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 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, "object int can.t.*await"): run_async(foo()) def test_await_2(self): async def foo(): await [] with self.assertRaisesRegex(TypeError, "object list can.t.*await"): 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, "object Awaitable can't be used in 'await' expression"): run_async(foo()) def test_await_9(self): def wrap(): return bar async def bar(): return 42 async def foo(): b = bar() 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' class Awaitable: def __await__(self): return coro() async def foo(): return await Awaitable() with self.assertRaisesRegex( TypeError, "__await__\(\) returned a coroutine"): run_async(foo()) 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_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 async def foo(): async with CM(): pass with self.assertRaisesRegex(AttributeError, '__aexit__'): run_async(foo()) def test_with_3(self): class CM: def __aexit__(self): pass async def foo(): async with CM(): pass with self.assertRaisesRegex(AttributeError, '__aenter__'): run_async(foo()) def test_with_4(self): class CM: def __enter__(self): pass def __exit__(self): pass async def foo(): async with CM(): pass with self.assertRaisesRegex(AttributeError, '__aexit__'): run_async(foo()) 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(): assert (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, "object int can't be used in 'await' expression"): # 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 async def foo(): async with CM(): 1/0 try: run_async(foo()) except TypeError as exc: self.assertRegex( exc.args[0], "object int can't be used in 'await' expression") 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 async def foo(): nonlocal CNT async with CM(): CNT += 1 with self.assertRaisesRegex( TypeError, "object int can't be used in 'await' expression"): run_async(foo()) self.assertEqual(CNT, 1) 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 async 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(): with self.assertWarnsRegex(PendingDeprecationWarning, "legacy"): 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 with self.assertWarnsRegex(PendingDeprecationWarning, "legacy"): 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 with self.assertWarnsRegex(PendingDeprecationWarning, "legacy"): 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, "async for' received an invalid object.*__aiter.*\: I"): 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_5(self): class I: async def __aiter__(self): return self def __anext__(self): return 123 async def foo(): with self.assertWarnsRegex(PendingDeprecationWarning, "legacy"): async for i in I(): print('never going to happen') with self.assertRaisesRegex( TypeError, "async for' received an invalid object.*__anext.*int"): run_async(foo()) 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: async def __aiter__(self): 1/0 async def foo(): nonlocal CNT with self.assertWarnsRegex(PendingDeprecationWarning, "legacy"): 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_9(self): # Test that PendingDeprecationWarning can safely be converted into # an exception (__aiter__ should not have a chance to raise # a ZeroDivisionError.) class AI: async def __aiter__(self): 1/0 async def foo(): async for i in AI(): pass with self.assertRaises(PendingDeprecationWarning): with warnings.catch_warnings(): warnings.simplefilter("error") run_async(foo()) def test_for_10(self): # Test that PendingDeprecationWarning can safely be converted into # an exception. class AI: async def __aiter__(self): pass async def foo(): async for i in AI(): pass with self.assertRaises(PendingDeprecationWarning): with warnings.catch_warnings(): warnings.simplefilter("error") run_async(foo()) 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() class CoroAsyncIOCompatTest(unittest.TestCase): def test_asyncio_1(self): # asyncio cannot be imported when Python is compiled without thread # support asyncio = support.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(None) self.assertEqual(buffer, [1, 2, 'MyException']) class SysSetCoroWrapperTest(unittest.TestCase): def test_set_wrapper_1(self): async def foo(): return 'spam' wrapped = None def wrap(gen): nonlocal wrapped wrapped = gen return gen self.assertIsNone(sys.get_coroutine_wrapper()) sys.set_coroutine_wrapper(wrap) self.assertIs(sys.get_coroutine_wrapper(), wrap) try: f = foo() self.assertTrue(wrapped) self.assertEqual(run_async(f), ([], 'spam')) finally: sys.set_coroutine_wrapper(None) self.assertIsNone(sys.get_coroutine_wrapper()) wrapped = None with silence_coro_gc(): foo() self.assertFalse(wrapped) def test_set_wrapper_2(self): self.assertIsNone(sys.get_coroutine_wrapper()) with self.assertRaisesRegex(TypeError, "callable expected, got int"): sys.set_coroutine_wrapper(1) self.assertIsNone(sys.get_coroutine_wrapper()) def test_set_wrapper_3(self): async def foo(): return 'spam' def wrapper(coro): async def wrap(coro): return await coro return wrap(coro) sys.set_coroutine_wrapper(wrapper) try: with silence_coro_gc(), self.assertRaisesRegex( RuntimeError, "coroutine wrapper.*\.wrapper at 0x.*attempted to " "recursively wrap .* wrap .*"): foo() finally: sys.set_coroutine_wrapper(None) def test_set_wrapper_4(self): @types.coroutine def foo(): return 'spam' wrapped = None def wrap(gen): nonlocal wrapped wrapped = gen return gen sys.set_coroutine_wrapper(wrap) try: foo() self.assertIs( wrapped, None, "generator-based coroutine was wrapped via " "sys.set_coroutine_wrapper") finally: sys.set_coroutine_wrapper(None) 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()