NameError:未定义全局名称“reduce" [英] NameError: global name 'reduce' is not defined

问题描述

我是 Python 新手.你能告诉我下面的代码有什么问题吗?当我运行它时，我收到一条错误消息NameError: global name 'reduce' is not defined".我问过谷歌，但没用.:(

I'm new to Python. Would you please tell me what's wrong with the following code? When I run it, I got an error message of "NameError: global name 'reduce' is not defined". I asked Goolge but it's useless. :(

def main():
    def add(x,y): return x+y
    reduce(add, range(1, 11))

if __name__=='__main__':
    main()

推荐答案

我猜:

1. 您使用的是 Python 3，并且
2. 您正在学习专为 Python 2 设计的教程.

reduce 函数，由于它不常用，从 Python 3 的内置函数中删除.它在 functools 模块中仍然可用，所以你可以这样做:

The reduce function, since it is not commonly used, was removed from the built-in functions in Python 3. It is still available in the functools module, so you can do:

import functools

def main():
    def add(x,y): return x+y
    functools.reduce(add, range(1, 11))

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