1、Python变量名可以包含字母、数字和下划线（_），变量不能以数字开头。
2、Python数据类型不需要指定type。
3、Python变量的“变”是指向，id。
Python 2.7.3 (default, Apr 10 2012, 23:31:26) [MSC v.1500 32 bit (Intel)] on win32 Type "copyright", "credits" or "license()" for more information. >>> x = 12 >>> y = 13 >>> print x,y 12 13 >>> help (id) Help on built-in function id in module __builtin__: id(...) id(object) -> integer Return the identity of an object. This is guaranteed to be unique among simultaneously existing objects. (Hint: it's the object's memory address.) >>> x = 13 >>> y = 12 >>> id(x) 23766712 >>> id(y) 23766724 >>> x = 12 >>> y = 13 >>> id(x) 23766724 >>> id(y) 23766712 >>> z = 13 >>> id(z) 23766712 >>> p = 'www.jeapedu.com' >>> type (x) <type 'int'> >>> type (p) <type 'str'> >>>
