Python Special Syntax 2:天才级的文档互动DocString

 

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.