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Update 07.字符串和常用数据结构.md 

07.字符串和常用数据结构.md

练习2：设计一个函数产生指定长度的验证码，验证码由大小写字母和数字构成。

参考答案：-->报错

UnboundLocalError: local variable 'code' referenced before assignment

增加  code ='' 后解决
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hjmking 2020-04-19 22:19:29 +08:00 committed by GitHub
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@ -456,6 +456,7 @@ def generate_code(code_len=4):
:return: 由大小写英文字母和数字构成的随机验证码
"""
code = ''
all_chars = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'
last_pos = len(all_chars) - 1
code = ''