Python装饰器,添加关键字参数与Python2和Python3的兼容性
我正在编写一个decorator,它将关键字参数添加到包装函数中。在本例中,装饰器添加关键字Python装饰器,添加关键字参数与Python2和Python3的兼容性,python,python-decorators,Python,Python Decorators,我正在编写一个decorator,它将关键字参数添加到包装函数中。在本例中,装饰器添加关键字deco0和deco1 def my_decorator(f): def inner(arg0, *args, deco0='deco0', deco1='deco1', **kwargs): """We assume decoarted functions will take at least one positional arg0""" print("Decor
deco0
和deco1
def my_decorator(f):
def inner(arg0, *args, deco0='deco0', deco1='deco1', **kwargs):
"""We assume decoarted functions will take at least one positional arg0"""
print("Decorated({}, {})".format(deco0, deco1))
return f(arg0, *args, **kwargs)
return inner
@my_decorator
def add2(x):
return x + 2
@my_decorator
def my_mult(x, y):
return x * y
if __name__ == '__main__':
print(add2(5))
print(add2(5, deco0='BLA'))
print(my_mult(2, 10))
print(my_mult(2, 10, deco1='BLAM'))
结果如预期:
Decorated(deco0, deco1)
7
Decorated(BLA, deco1)
7
Decorated(deco0, deco1)
20
Decorated(deco0, BLAM)
20
装饰程序返回的内部
函数签名与python2不兼容:
File "./deco.py", line 5
def inner(arg0, *args, deco0='deco0', deco1='deco1', **kwargs):
^
SyntaxError: invalid syntax
Python2中是否有一种设计模式可以帮助装饰者添加关键字参数?或者更好的是,一个与Python2和Python3同时兼容的模式?我认为您必须在内部函数中执行类似于修改
kwargs
的操作:
def inner(arg0, *args, **kwargs):
deco0 = kwargs.pop('deco0', 'deco0')
deco1 = kwargs.pop('deco1', 'deco1')
print("Decorated({}, {})".format(deco0, deco1))
return f(arg0, *args, **kwargs)