变量和数据类型：Python是一种动态类型的语言，这意味着变量不需要事先声明类型，而是在运行时根据赋值的值自动推断类型。Python支持多种数据类型，如整数、浮点数、字符串、列表、元组、字典、集合等，每种数据类型都有自己的特点和操作方法。

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