I am trying to find a way to pass my functions default arguments to the decorator. I have to say I am fairly new to the decorator business, so maybe I just don't understand it properly, but I have not found any answers yet.
So here my modified example from the python functools.wraps manual page.
from functools import wraps
def my_decorator(f):
@wraps(f)
def wrapper(*args, **kwds):
print 'Calling decorated function'
print 'args:', args
print 'kwargs:', kwds
return f(*args, **kwds)
return wrapper
@my_decorator
def example(i, j=0):
"""Docstring"""
print 'Called example function'
example(i=1)
I want the j=0 to be passed, too. So that the output should be:
Calling decorated function
args: ()
kwargs: {'i': 1, 'j': 0}
Called example function
解決方案
You can get default argument values by using __defaults__ special attribute.
def my_decorator(f):
@wraps(f)
def wrapper(*args, **kwds):
print('def args values', f.__defaults__)
return f(*args, **kwds)
return wrapper
A tuple containing default argument values for those arguments that have defaults, or None if no arguments have a default value