python decorator with arguments of decorated function

Question

When I wrap a function with @, how do I make the wrapper function look & feel exactly like the wrapped function? help(function) in particular.<

Answer 1

Use functools.wraps:

from functools import wraps

def wrapper(f):
    @wraps(f)
    def call(*args, **kw):
        print('in', f, args, kw)
        return f(*args, **kw)
    return call

@wrapper
def f(a, b = 1, g = g, *args, **kw):
    pass

help(f)
Help on function f in module __main__:

f(a, b=1, g=, *args, **kw)

This preserves the __name__ and __doc__ attributes of your wrapped function.