Python 创建变量
创建变量
变量是用于存储数据值的容器。
与其他编程语言不同，Python 没有用于声明变量的命令。
变量是在你第一次为其赋值时创建的。
变量不需要用任何特定类型声明，甚至可以在设置后更改类型。
字符串变量可以使用单引号或双引号声明
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