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Python的变量名是区分大小写的,例如:name和Name就是两个变量名,而非相同变量。
变量(variable)是学习python初始时,就会接触到的一个新的知识点,也是一个需要熟知的概念。python是一种动态类型语言,在赋值的执行中可以绑定不同类型的值,这个过程叫做变量赋值操作,赋值同时确定了变量类型。
什么是变量
在python学习过程中会用到许多数据,那为了方便操作,需要把这些数据分别用一个简单的名字代表,方便在接下来的程序中引用。变量就是代表某个数据(值)的名称。
python变量赋值如何定义操作
变量定义方法很简单:1>>> x = 5
这个操作过程就是赋值,意思把整型数字5赋值给了变量x,用等号来连接变量名和值。之后就可以在表达式中使用这个新变量了。1
2>>> x * 3
15
注意:在赋值时,值是什么数据类型,就决定了这个变量的类型,变量名引用了数值的同时也引用了它的类型。
变量命名规范
1、变量名可以包括字母、数字、下划线,但是数字不能做为开头。例如:name1是合法变量名,而1name就不可以。
2、系统关键字不能做变量名使用
3、除了下划线之外,其它符号不能做为变量名使用