def test_inspect_signature_property():
if not PY3:
return
# By adding AddX to our signature registry, we can inspect the class
# itself and objects of the class. `inspect.signature` doesn't like
# it when `obj.__signature__` is a property.
class AddX(object):
def __init__(self, func):
self.func = func
def __call__(self, addx, *args, **kwargs):
return addx + self.func(*args, **kwargs)
@property
def __signature__(self):
sig = inspect.signature(self.func)
params = list(sig.parameters.values())
kind = inspect.Parameter.POSITIONAL_OR_KEYWORD
newparam = inspect.Parameter("addx", kind)
params = [newparam] + params
return sig.replace(parameters=params)
addx = AddX(lambda x: x)
sig = inspect.signature(addx)
assert sig == inspect.Signature(parameters=[
inspect.Parameter("addx", inspect.Parameter.POSITIONAL_OR_KEYWORD),
inspect.Parameter("x", inspect.Parameter.POSITIONAL_OR_KEYWORD),
])
assert num_required_args(AddX) is False
_sigs.signatures[AddX] = (_sigs.expand_sig((0, lambda func: None)), )
assert num_required_args(AddX) == 1
del _sigs.signatures[AddX]
def test_inspect_signature_property():
if not PY3:
return
# By adding AddX to our signature registry, we can inspect the class
# itself and objects of the class. `inspect.signature` doesn't like
# it when `obj.__signature__` is a property.
class AddX(object):
def __init__(self, func):
self.func = func
def __call__(self, addx, *args, **kwargs):
return addx + self.func(*args, **kwargs)
@property
def __signature__(self):
sig = inspect.signature(self.func)
params = list(sig.parameters.values())
kind = inspect.Parameter.POSITIONAL_OR_KEYWORD
newparam = inspect.Parameter('addx', kind)
params = [newparam] + params
return sig.replace(parameters=params)
addx = AddX(lambda x: x)
sig = inspect.signature(addx)
assert sig == inspect.Signature(parameters=[
inspect.Parameter('addx', inspect.Parameter.POSITIONAL_OR_KEYWORD),
inspect.Parameter('x', inspect.Parameter.POSITIONAL_OR_KEYWORD)])
assert num_required_args(AddX) is False
_sigs.signatures[AddX] = (_sigs.expand_sig((0, lambda func: None)),)
assert num_required_args(AddX) == 1
del _sigs.signatures[AddX]
def test_inspect_wrapped_property():
class Wrapped(object):
def __init__(self, func):
self.func = func
def __call__(self, *args, **kwargs):
return self.func(*args, **kwargs)
@property
def __wrapped__(self):
return self.func
func = lambda x: x
wrapped = Wrapped(func)
assert inspect.signature(func) == inspect.signature(wrapped)
assert num_required_args(Wrapped) is None
_sigs.signatures[Wrapped] = (_sigs.expand_sig((0, lambda func: None)), )
assert num_required_args(Wrapped) == 1
def test_inspect_wrapped_property():
class Wrapped(object):
def __init__(self, func):
self.func = func
def __call__(self, *args, **kwargs):
return self.func(*args, **kwargs)
@property
def __wrapped__(self):
return self.func
func = lambda x: x
wrapped = Wrapped(func)
if PY3:
assert inspect.signature(func) == inspect.signature(wrapped)
assert num_required_args(Wrapped) == (False if PY33 else None)
_sigs.signatures[Wrapped] = (_sigs.expand_sig((0, lambda func: None)),)
assert num_required_args(Wrapped) == 1