Python函数执行
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Python function execution
提问by RaviTej310
So i found this site called codewars.com and wanted to signup. When i selected my language as python, it gave me a problem to solve:
所以我找到了这个名为 codewars.com 的网站，并想注册。当我选择我的语言作为 python 时，它给了我一个需要解决的问题：
The code does not execute properly. Try to figure out why.
代码没有正确执行。试着找出原因。
def multiply(a, b):
a * b
I am not able to figure out why. It executes correctly in PyCharm using python 3.4 when i added print(a*b)instead of a*b and when i called the function using multiply(2,3). The code is also being successfully executed using just the given snippet. It has been given that the above python code is in 2.7 Any ideas?
我不知道为什么。当我添加print(a*b)而不是 a*b 并且当我使用multiply(2,3). 仅使用给定的代码片段也可以成功执行代码。已经给出上述python代码在2.7中的任何想法？
采纳答案by fedorqui 'SO stop harming'
If it is a function, it needs to return something. Otherwise, running it is kind of useless.
如果它是一个函数，它需要返回一些东西。否则，运行它是没有用的。
So you probably need to say:
所以你可能需要说：
def multiply(a, b):
return a * b
You probably want to read more about functions in Python and when this would make sense (passing by reference, for example). This can be a good starting point: Python functions.
您可能想阅读有关 Python 中函数的更多信息以及何时有意义（例如，通过引用传递）。这可能是一个很好的起点：Python 函数。
回答by yanghaogn
There is no return value, the code will be OK
没有返回值，代码就OK了
def multiply(a, b):
return a * b
