decorator with functools.wraps

decorators3.py

from functools import wraps

def binary(func):
    @wraps(func)
    def to_bin(*args, **kwargs): 
        '''convert result to binary'''
        return bin(func(*args, **kwargs))
    return to_bin

@binary
def foo(x):
    '''does some math'''
    return x * x

print foo.__name__
print foo.__doc__
print foo(5)

output:
foo
does some math
0b11001