python 错误。我不明白我做错了什么

Question

我对自己做错了什么很迷茫...我已经在网上搜索了几个小时，尝试重新格式化我的代码，但现在我只是觉得卡住了。

这是我的代码:

import httplib
import json

urlBase = 'amoeba.im'
token = False
username = raw_input('Username? ')

connection = httplib.HTTPConnection(urlBase)

def get(url):
    connection.request("GET", url)
    response = connection.getresponse()
    print response.status, response.reason
    print response.read();
    if token == False:
        token = response.read()
        token = token.split('"token":"')[1]
        token = token.split('","')[0]
        print token

get('/api/login?username=' + username)

get('/api/rooms/join?room=#lobby&token=' + token)

get('/api/postmessage?message=hello%20world&token=' + token)

connection.close()

这是终端输出:

Tyler-Keohanes-MacBook-Pro:~ tylerkeohane$ clear && '/usr/bin/pythonw' '/Users/tylerkeohane/Desktop/chatbot.py'
Username? TgwizBot
200 OK
{"success":true,"username":"TgwizBot","token":"103f6a2809eafb6","users":[{"username":"razerwolf","seen":1338582178260},{"username":"tonynoname","seen":1338582178028},{"username":"arrum","seen":1338582177804},{"username":"Valerio","seen":1338582177504},{"username":"Tgwizman","seen":1338582177258},{"username":"tonynoname2","seen":1338582178004},{"username":"TgwizBot","seen":1338582182219}],"time":1338582182219}
Traceback (most recent call last):
  File "/Users/tylerkeohane/Desktop/chatbot.py", line 21, in <module>
    get('/api/login?username=' + username)
  File "/Users/tylerkeohane/Desktop/chatbot.py", line 15, in get
    if token == False:
UnboundLocalError: local variable 'token' referenced before assignment
Tyler-Keohanes-MacBook-Pro:~ tylerkeohane$ 

有人可以帮忙吗？ :(

Answer 1

线索在这里:

UnboundLocalError: local variable 'token' referenced before assignment

您需要将 token 声明为全局的:

def get(url):
    global token
    ...

您可能还想考虑避免使用全局变量，因为它们通常被认为是一种不好的做法。