Demo `getargspec` and `getfullargspec`

demo_argspec.py

from inspect import getargspec, getfullargspec


def kwargs_only(a, b, c=3, d=4, **kwargs):
    pass

def default_args(a, b, c=3, d=4, *args, **kwargs):
    pass

def default_kwargs(a, b, *args, c=3, d=4, **kwargs):
    pass


print(getfullargspec(kwargs_only))
# FullArgSpec(args=['a', 'b', 'c', 'd'], varargs=None, varkw='kwargs', defaults=(3, 4), kwonlyargs=[], kwonlydefaults=None, annotations={})

print(getfullargspec(default_args))
# FullArgSpec(args=['a', 'b', 'c', 'd'], varargs='args', varkw='kwargs', defaults=(3, 4), kwonlyargs=[], kwonlydefaults=None, annotations={})

print(getfullargspec(default_kwargs))
# FullArgSpec(args=['a', 'b'], varargs='args', varkw='kwargs', defaults=None, kwonlyargs=['c', 'd'], kwonlydefaults={'c': 3, 'd': 4}, annotations={})


print(getargspec(kwargs_only))
# ArgSpec(args=['a', 'b', 'c', 'd'], varargs=None, keywords='kwargs', defaults=(3, 4))

print(getargspec(default_args))
# ArgSpec(args=['a', 'b', 'c', 'd'], varargs='args', keywords='kwargs', defaults=(3, 4))

print(getargspec(default_kwargs))
# ValueError: Function has keyword-only parameters or annotations, use getfullargspec() API which can support them