摘要:
问题1: ERROR: Could not find a version that satisfies the requirement xlwt (from vers ions: none)ERROR: No matching distribution found for xlwt 原因:网络问题或 阅读全文
摘要:
出现UnboundLocalError: local variable ‘a’ referenced before assignment异常的情况与解决方法字面意思:局部变量赋值前被引用原因:局部变量与全局变量同名例: a = 1 def func(): a += 1 print(a) func() 阅读全文