Python变量解析
变量：可变化数据对象的程序标示符，变量指向某个数据单元，变量的变化是指向的地址变化，类似指针，所以定义变量不需要声明数据类型，不能通过变量改变变量的值，只能重新通过变化指向
C语言中的变量
变量的内容可以变，地址是不能变化的，已经申明地址不能改变
例子
>>> 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.) >>> id(x) 34124808 >>> print x 13 >>> id(x) 34124808 >>> x=12 >>> print x 12 >>> id(x) 34124820 >>> id(y) 34124808 >>> y = x >>> id(x) 34124820 >>> id(y) 34124820 >>> y 12 >>> x=12 >>> y=12.5 >>> z=‘www.bling.com‘ >>> x 12 >>> y 12.5 >>> z ‘www.bling.com‘ >>> type(x) <type ‘int‘> >>> type(y) <type ‘float‘> >>> type(z) <type ‘str‘>
程序 x = 12 y = 13 print ‘x = ‘,x,id(x) print ‘y = ‘,y,id(y) x = y print ‘x = ‘,x,id(x) print ‘y = ‘,y,id(y) x = 14 y = 15 print ‘x = ‘,x,id(x) print ‘y = ‘,y,id(y) 输出结果 x = 12 6534164 y = 13 6534152 x = 13 6534152 y = 13 6534152 x = 14 6534140 y = 15 6534128