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from __future__ import absolute_import
import inspect
import sys
HAS_INSPECT_SIGNATURE = sys.version_info >= (3, 3)
def getargspec(func):
if not HAS_INSPECT_SIGNATURE:
return inspect.getargspec(func)
sig = inspect.signature(func)
args = [
p.name for p in sig.parameters.values()
if p.kind == inspect.Parameter.POSITIONAL_OR_KEYWORD
]
varargs = [
p.name for p in sig.parameters.values()
if p.kind == inspect.Parameter.VAR_POSITIONAL
]
varargs = varargs[0] if varargs else None
varkw = [
p.name for p in sig.parameters.values()
if p.kind == inspect.Parameter.VAR_KEYWORD
]
varkw = varkw[0] if varkw else None
defaults = [
p.default for p in sig.parameters.values()
if p.kind == inspect.Parameter.POSITIONAL_OR_KEYWORD and p.default is not p.empty
] or None
return args, varargs, varkw, defaults
def get_func_args(func):
if not HAS_INSPECT_SIGNATURE:
argspec = inspect.getargspec(func)
return argspec.args[1:] # ignore 'self'
sig = inspect.signature(func)
return [
arg_name for arg_name, param in sig.parameters.items()
if param.kind == inspect.Parameter.POSITIONAL_OR_KEYWORD
]
def func_accepts_kwargs(func):
if not HAS_INSPECT_SIGNATURE:
# Not all callables are inspectable with getargspec, so we'll
# try a couple different ways but in the end fall back on assuming
# it is -- we don't want to prevent registration of valid but weird
# callables.
try:
argspec = inspect.getargspec(func)
except TypeError:
try:
argspec = inspect.getargspec(func.__call__)
except (TypeError, AttributeError):
argspec = None
return not argspec or argspec[2] is not None
return any(
p for p in inspect.signature(func).parameters.values()
if p.kind == p.VAR_KEYWORD
)
def func_has_no_args(func):
args = inspect.getargspec(func)[0] if not HAS_INSPECT_SIGNATURE else [
p for p in inspect.signature(func).parameters.values()
if p.kind == p.POSITIONAL_OR_KEYWORD and p.default is p.empty
]
return len(args) == 1
def func_supports_parameter(func, parameter):
if HAS_INSPECT_SIGNATURE:
return parameter in inspect.signature(func).parameters
else:
args, varargs, varkw, defaults = inspect.getargspec(func)
return parameter in args
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