为什么在分配函数中增加变量时，Python会在分配之前抱怨引用？ [英] Why does Python complain about reference before assignment when increasing variables in a function?

问题描述

为什么Python会在分配前引用 chrome 被引用？它不会抱怨字典。这是与Python 2.5，如果它有所作为。

  def f（）：
 google ['browser'] ='chrome'
 chrome + = 1 
 
 google = dict（）
 chrome = 1 
f（）
  

当然，我可以使用全局chrome ，但我想知道为什么Python不考虑要分配的变量。感谢。

/python-functions-assignments-and-scope.htmlrel =nofollow>阅读这里

Why does Python complain about chrome being referenced before assignment? It does not complain about the dictionary. This is with Python 2.5 if it makes a difference.

def f():
  google['browser'] = 'chrome'
  chrome += 1

google = dict()
chrome = 1
f()

I can make it work with global chrome of course, but I'd like to know why Python does't consider the variable to be assigned. Thanks.

解决方案

It's out of scope: read here

这篇关于为什么在分配函数中增加变量时，Python会在分配之前抱怨引用？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！