TypeError: 'NoneType' object is not callable

TypeError: 'NoneType' object is not callable

 None类型不是一个可以可以调用（callable）对象

赋值语句错误，值为None

callable对象是指一个后面可以加（）的对象，一般把调用函数时（）去掉

函数例子

def use_logging(func):
    def wrapper(*args,**kwargs):
        logging.warning("%s is runing" % func.__name__)
        return func(*args)
    return wrapper()

@use_logging
def foo():
    print('i am foo')
#@use_logging
def bar():
    print('i am bar')

bar = use_logging(bar)
bar
或者

@use_logging

def bar():

    print('i am bar')
bar