Python UnboundLocalError: local variable ‘str‘ referenced before assignment

0x00 错误

Traceback (most recent call last):
  File "/Users/apple/Desktop/Me/My/Python3/MyCode/test.py", line 43, in 
    test()
  File "/Users/apple/Desktop/Me/My/Python3/MyCode/test.py", line 13, in test
    s = str(count)
UnboundLocalError: local variable 'str' referenced before assignment

0x01 代码

代码：

import requests
from bs4 import BeautifulSoup as bs

def test():
    
    count = 0
    while True:
        count += 1
        s = str(count)
        print('第 ' + s + ' 次')
        break

    print('begin...')
    
    headers = {'user-agent':'Mozilla/5.0 (Linux; Android 6.0; Nexus 5 Build/MRA58N) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/98.0.4758.109 Mobile Safari/537.36'}
    url = 'https://www.xxx.xxxx'
    r = requests.get(url, headers = headers)
    soup = bs(r.text, 'lxml')

    kk = soup.find(class_='xxxxx')
    str = kk.text
    arr = str.split('个')
    
    if len(arr) == 2:
        count = arr[0]
        if len(count) > 0:
            if int(count) > 10:
                print(str)


if __name__ == '__main__':
    test()

数字转字符串不就是这样么？

count = 0
str(count)

全局搜索了一下代码
原来在后面定义了一个 str 变量
这个变量，覆盖了系统的类 str
所以，导致了
UnboundLocalError: local variable 'str' referenced before assignment

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0x02 办法

既然是命名覆盖，那就换个名字好了~
要注意的一件事情是：
不要跟系统的类重名了！

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小笔记应用

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