摘要：
Django ORM 连接超时的坑 数据库链接丢失异常 django.db.utils.OperationalError: (2013, 'Lost connection to MySQL server during query') 查询mysql全局变量SHOW GLOBAL VARIABLES; 阅读全文
摘要：
# 赋值 a = 1 b = a print(a, b) print(id(a), id(b)) # id是相同的 c = [1, 2, 3] d = c c[0] = "xiongsheng" print(c, d) # 浅拷贝 import copy li1 = [1, 2, 3] li2 = 阅读全文