1.Python中一切皆对象
2.Python中不需要申明对象类型，对象的类型由运行的表达式决定
3.创建了对象意味着绑定了对象的操作到此对象，也就是在固有的对象上只能调用该对象特有的操作。比如只能将String操作用在String对象上，list操作用在list对象上。
4.Python内置数据类型：
(1)Number
• Integer and floating-point objects
• Complex number objects
• Decimal: fixed-precision objects
• Fraction: rational number objects
• Sets: collections with numeric operations
• Booleans: true and false
• Built-in functions and modules: round, math, random, etc.
• Expressions; unlimited integer precision; bitwise operations; hex, octal, and binary
formats
• Third-party extensions: vectors, libraries, visualization, plotting, etc.
(2)Strings
(3)Lists
(4)Dictionaries
(5)Tuples
(6)Files
(7)Sets
(8)Other core types
(9)Program unit types
(10)Implementation-related types
5.内置数据类型分类：
不可变数据类型(对象一旦创建就不可改变）：Numbes,Strings,Tuples,Byte
可变数据类型：Lists,Dictionaries,Bytearrays
序列类型：Strings,Lists
映射类型：Dictionaries