a=None for i in a: print(‘zheli de i shi %d‘ % i)
报错: TypeError: ‘NoneType‘ object is not iterable
除非你提供你自己的
return
语句,每个函数都在结尾暗含有return None
语句。
关于DocString:
def testing(x): ‘‘‘This is a test function. This is a great feature.You must learn how to use this.‘‘‘ print(‘Your input is ‘,x) print(testing.__doc__) testing(18) testing(5) help(testing) 输出:This is a test function.
This is a great feature.You must learn how to use this.
(‘Your input is ‘, 18)
(‘Your input is ‘, 5)
Help on function testing in module __main__:testing(x)
This is a test function.This is a great feature.You must learn how to use this.
Python Special Syntax 2,布布扣,bubuko.com
时间: 2024-10-05 04:58:36