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cpython/Lib/test/test_call.py

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import datetime
import unittest
from test.support import cpython_only
try:
import _testcapi
except ImportError:
_testcapi = None
import struct
import collections
import itertools
class FunctionCalls(unittest.TestCase):
def test_kwargs_order(self):
# bpo-34320: **kwargs should preserve order of passed OrderedDict
od = collections.OrderedDict([('a', 1), ('b', 2)])
od.move_to_end('a')
expected = list(od.items())
def fn(**kw):
return kw
res = fn(**od)
self.assertIsInstance(res, dict)
self.assertEqual(list(res.items()), expected)
# The test cases here cover several paths through the function calling
# code. They depend on the METH_XXX flag that is used to define a C
# function, which can't be verified from Python. If the METH_XXX decl
# for a C function changes, these tests may not cover the right paths.
class CFunctionCalls(unittest.TestCase):
def test_varargs0(self):
self.assertRaises(TypeError, {}.__contains__)
def test_varargs1(self):
{}.__contains__(0)
def test_varargs2(self):
self.assertRaises(TypeError, {}.__contains__, 0, 1)
def test_varargs0_ext(self):
try:
{}.__contains__(*())
except TypeError:
pass
def test_varargs1_ext(self):
{}.__contains__(*(0,))
def test_varargs2_ext(self):
try:
{}.__contains__(*(1, 2))
except TypeError:
pass
else:
raise RuntimeError
def test_varargs1_kw(self):
self.assertRaises(TypeError, {}.__contains__, x=2)
def test_varargs2_kw(self):
self.assertRaises(TypeError, {}.__contains__, x=2, y=2)
def test_oldargs0_0(self):
{}.keys()
def test_oldargs0_1(self):
self.assertRaises(TypeError, {}.keys, 0)
def test_oldargs0_2(self):
self.assertRaises(TypeError, {}.keys, 0, 1)
def test_oldargs0_0_ext(self):
{}.keys(*())
def test_oldargs0_1_ext(self):
try:
{}.keys(*(0,))
except TypeError:
pass
else:
raise RuntimeError
def test_oldargs0_2_ext(self):
try:
{}.keys(*(1, 2))
except TypeError:
pass
else:
raise RuntimeError
def test_oldargs0_0_kw(self):
try:
{}.keys(x=2)
except TypeError:
pass
else:
raise RuntimeError
def test_oldargs0_1_kw(self):
self.assertRaises(TypeError, {}.keys, x=2)
def test_oldargs0_2_kw(self):
self.assertRaises(TypeError, {}.keys, x=2, y=2)
def test_oldargs1_0(self):
self.assertRaises(TypeError, [].count)
def test_oldargs1_1(self):
[].count(1)
def test_oldargs1_2(self):
self.assertRaises(TypeError, [].count, 1, 2)
def test_oldargs1_0_ext(self):
try:
[].count(*())
except TypeError:
pass
else:
raise RuntimeError
def test_oldargs1_1_ext(self):
[].count(*(1,))
def test_oldargs1_2_ext(self):
try:
[].count(*(1, 2))
except TypeError:
pass
else:
raise RuntimeError
def test_oldargs1_0_kw(self):
self.assertRaises(TypeError, [].count, x=2)
def test_oldargs1_1_kw(self):
self.assertRaises(TypeError, [].count, {}, x=2)
def test_oldargs1_2_kw(self):
self.assertRaises(TypeError, [].count, x=2, y=2)
@cpython_only
class CFunctionCallsErrorMessages(unittest.TestCase):
def test_varargs0(self):
msg = r"__contains__\(\) takes exactly one argument \(0 given\)"
self.assertRaisesRegex(TypeError, msg, {}.__contains__)
def test_varargs2(self):
msg = r"__contains__\(\) takes exactly one argument \(2 given\)"
self.assertRaisesRegex(TypeError, msg, {}.__contains__, 0, 1)
def test_varargs3(self):
msg = r"^from_bytes\(\) takes exactly 2 positional arguments \(3 given\)"
self.assertRaisesRegex(TypeError, msg, int.from_bytes, b'a', 'little', False)
def test_varargs1min(self):
msg = r"get expected at least 1 argument, got 0"
self.assertRaisesRegex(TypeError, msg, {}.get)
msg = r"expected 1 argument, got 0"
self.assertRaisesRegex(TypeError, msg, {}.__delattr__)
def test_varargs2min(self):
msg = r"getattr expected at least 2 arguments, got 0"
self.assertRaisesRegex(TypeError, msg, getattr)
def test_varargs1max(self):
msg = r"input expected at most 1 argument, got 2"
self.assertRaisesRegex(TypeError, msg, input, 1, 2)
def test_varargs2max(self):
msg = r"get expected at most 2 arguments, got 3"
self.assertRaisesRegex(TypeError, msg, {}.get, 1, 2, 3)
def test_varargs1_kw(self):
msg = r"__contains__\(\) takes no keyword arguments"
self.assertRaisesRegex(TypeError, msg, {}.__contains__, x=2)
def test_varargs2_kw(self):
msg = r"__contains__\(\) takes no keyword arguments"
self.assertRaisesRegex(TypeError, msg, {}.__contains__, x=2, y=2)
def test_varargs3_kw(self):
msg = r"bool\(\) takes no keyword arguments"
self.assertRaisesRegex(TypeError, msg, bool, x=2)
def test_varargs4_kw(self):
msg = r"^index\(\) takes no keyword arguments$"
self.assertRaisesRegex(TypeError, msg, [].index, x=2)
def test_varargs5_kw(self):
msg = r"^hasattr\(\) takes no keyword arguments$"
self.assertRaisesRegex(TypeError, msg, hasattr, x=2)
def test_varargs6_kw(self):
msg = r"^getattr\(\) takes no keyword arguments$"
self.assertRaisesRegex(TypeError, msg, getattr, x=2)
def test_varargs7_kw(self):
msg = r"^next\(\) takes no keyword arguments$"
self.assertRaisesRegex(TypeError, msg, next, x=2)
def test_varargs8_kw(self):
msg = r"^pack\(\) takes no keyword arguments$"
self.assertRaisesRegex(TypeError, msg, struct.pack, x=2)
def test_varargs9_kw(self):
msg = r"^pack_into\(\) takes no keyword arguments$"
self.assertRaisesRegex(TypeError, msg, struct.pack_into, x=2)
def test_varargs10_kw(self):
msg = r"^index\(\) takes no keyword arguments$"
self.assertRaisesRegex(TypeError, msg, collections.deque().index, x=2)
def test_varargs11_kw(self):
msg = r"^pack\(\) takes no keyword arguments$"
self.assertRaisesRegex(TypeError, msg, struct.Struct.pack, struct.Struct(""), x=2)
def test_varargs12_kw(self):
msg = r"^staticmethod\(\) takes no keyword arguments$"
self.assertRaisesRegex(TypeError, msg, staticmethod, func=id)
def test_varargs13_kw(self):
msg = r"^classmethod\(\) takes no keyword arguments$"
self.assertRaisesRegex(TypeError, msg, classmethod, func=id)
def test_varargs14_kw(self):
msg = r"^product\(\) takes at most 1 keyword argument \(2 given\)$"
self.assertRaisesRegex(TypeError, msg,
itertools.product, 0, repeat=1, foo=2)
def test_varargs15_kw(self):
msg = r"^ImportError\(\) takes at most 2 keyword arguments \(3 given\)$"
self.assertRaisesRegex(TypeError, msg,
ImportError, 0, name=1, path=2, foo=3)
def test_varargs16_kw(self):
msg = r"^min\(\) takes at most 2 keyword arguments \(3 given\)$"
self.assertRaisesRegex(TypeError, msg,
min, 0, default=1, key=2, foo=3)
def test_varargs17_kw(self):
msg = r"^print\(\) takes at most 4 keyword arguments \(5 given\)$"
self.assertRaisesRegex(TypeError, msg,
print, 0, sep=1, end=2, file=3, flush=4, foo=5)
def test_oldargs0_1(self):
msg = r"keys\(\) takes no arguments \(1 given\)"
self.assertRaisesRegex(TypeError, msg, {}.keys, 0)
def test_oldargs0_2(self):
msg = r"keys\(\) takes no arguments \(2 given\)"
self.assertRaisesRegex(TypeError, msg, {}.keys, 0, 1)
def test_oldargs0_1_kw(self):
msg = r"keys\(\) takes no keyword arguments"
self.assertRaisesRegex(TypeError, msg, {}.keys, x=2)
def test_oldargs0_2_kw(self):
msg = r"keys\(\) takes no keyword arguments"
self.assertRaisesRegex(TypeError, msg, {}.keys, x=2, y=2)
def test_oldargs1_0(self):
msg = r"count\(\) takes exactly one argument \(0 given\)"
self.assertRaisesRegex(TypeError, msg, [].count)
def test_oldargs1_2(self):
msg = r"count\(\) takes exactly one argument \(2 given\)"
self.assertRaisesRegex(TypeError, msg, [].count, 1, 2)
def test_oldargs1_0_kw(self):
msg = r"count\(\) takes no keyword arguments"
self.assertRaisesRegex(TypeError, msg, [].count, x=2)
def test_oldargs1_1_kw(self):
msg = r"count\(\) takes no keyword arguments"
self.assertRaisesRegex(TypeError, msg, [].count, {}, x=2)
def test_oldargs1_2_kw(self):
msg = r"count\(\) takes no keyword arguments"
self.assertRaisesRegex(TypeError, msg, [].count, x=2, y=2)
def pyfunc(arg1, arg2):
return [arg1, arg2]
def pyfunc_noarg():
return "noarg"
class PythonClass:
def method(self, arg1, arg2):
return [arg1, arg2]
def method_noarg(self):
return "noarg"
@classmethod
def class_method(cls):
return "classmethod"
@staticmethod
def static_method():
return "staticmethod"
PYTHON_INSTANCE = PythonClass()
IGNORE_RESULT = object()
@cpython_only
class FastCallTests(unittest.TestCase):
# Test calls with positional arguments
CALLS_POSARGS = (
# (func, args: tuple, result)
# Python function with 2 arguments
(pyfunc, (1, 2), [1, 2]),
# Python function without argument
(pyfunc_noarg, (), "noarg"),
# Python class methods
(PythonClass.class_method, (), "classmethod"),
(PythonClass.static_method, (), "staticmethod"),
# Python instance methods
(PYTHON_INSTANCE.method, (1, 2), [1, 2]),
(PYTHON_INSTANCE.method_noarg, (), "noarg"),
(PYTHON_INSTANCE.class_method, (), "classmethod"),
(PYTHON_INSTANCE.static_method, (), "staticmethod"),
# C function: METH_NOARGS
(globals, (), IGNORE_RESULT),
# C function: METH_O
(id, ("hello",), IGNORE_RESULT),
# C function: METH_VARARGS
(dir, (1,), IGNORE_RESULT),
# C function: METH_VARARGS | METH_KEYWORDS
(min, (5, 9), 5),
# C function: METH_FASTCALL
(divmod, (1000, 33), (30, 10)),
# C type static method: METH_FASTCALL | METH_CLASS
(int.from_bytes, (b'\x01\x00', 'little'), 1),
# bpo-30524: Test that calling a C type static method with no argument
# doesn't crash (ignore the result): METH_FASTCALL | METH_CLASS
(datetime.datetime.now, (), IGNORE_RESULT),
)
# Test calls with positional and keyword arguments
CALLS_KWARGS = (
# (func, args: tuple, kwargs: dict, result)
# Python function with 2 arguments
(pyfunc, (1,), {'arg2': 2}, [1, 2]),
(pyfunc, (), {'arg1': 1, 'arg2': 2}, [1, 2]),
# Python instance methods
(PYTHON_INSTANCE.method, (1,), {'arg2': 2}, [1, 2]),
(PYTHON_INSTANCE.method, (), {'arg1': 1, 'arg2': 2}, [1, 2]),
# C function: METH_VARARGS | METH_KEYWORDS
(max, ([],), {'default': 9}, 9),
# C type static method: METH_FASTCALL | METH_CLASS
(int.from_bytes, (b'\x01\x00',), {'byteorder': 'little'}, 1),
(int.from_bytes, (), {'bytes': b'\x01\x00', 'byteorder': 'little'}, 1),
)
def check_result(self, result, expected):
if expected is IGNORE_RESULT:
return
self.assertEqual(result, expected)
def test_fastcall(self):
# Test _PyObject_FastCall()
for func, args, expected in self.CALLS_POSARGS:
with self.subTest(func=func, args=args):
result = _testcapi.pyobject_fastcall(func, args)
self.check_result(result, expected)
if not args:
# args=NULL, nargs=0
result = _testcapi.pyobject_fastcall(func, None)
self.check_result(result, expected)
def test_fastcall_dict(self):
# Test _PyObject_FastCallDict()
for func, args, expected in self.CALLS_POSARGS:
with self.subTest(func=func, args=args):
# kwargs=NULL
result = _testcapi.pyobject_fastcalldict(func, args, None)
self.check_result(result, expected)
# kwargs={}
result = _testcapi.pyobject_fastcalldict(func, args, {})
self.check_result(result, expected)
if not args:
# args=NULL, nargs=0, kwargs=NULL
result = _testcapi.pyobject_fastcalldict(func, None, None)
self.check_result(result, expected)
# args=NULL, nargs=0, kwargs={}
result = _testcapi.pyobject_fastcalldict(func, None, {})
self.check_result(result, expected)
for func, args, kwargs, expected in self.CALLS_KWARGS:
with self.subTest(func=func, args=args, kwargs=kwargs):
result = _testcapi.pyobject_fastcalldict(func, args, kwargs)
self.check_result(result, expected)
def test_fastcall_keywords(self):
# Test _PyObject_FastCallKeywords()
for func, args, expected in self.CALLS_POSARGS:
with self.subTest(func=func, args=args):
# kwnames=NULL
result = _testcapi.pyobject_fastcallkeywords(func, args, None)
self.check_result(result, expected)
# kwnames=()
result = _testcapi.pyobject_fastcallkeywords(func, args, ())
self.check_result(result, expected)
if not args:
# kwnames=NULL
result = _testcapi.pyobject_fastcallkeywords(func, None, None)
self.check_result(result, expected)
# kwnames=()
result = _testcapi.pyobject_fastcallkeywords(func, None, ())
self.check_result(result, expected)
for func, args, kwargs, expected in self.CALLS_KWARGS:
with self.subTest(func=func, args=args, kwargs=kwargs):
kwnames = tuple(kwargs.keys())
args = args + tuple(kwargs.values())
result = _testcapi.pyobject_fastcallkeywords(func, args, kwnames)
self.check_result(result, expected)
if __name__ == "__main__":
unittest.main()
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