Python 基础之二用户交互input

Input是个内建函数：

 >>> input
 <built-in function input>
 >>>  

具体用法：接收用户输入的内容，输入的字符串，接收到就是字符串；输入的是数字，接收的就是数字

 >>> name = input("please input your name:")
 please input your name:python
 >>> name
 'python'
 >>> print(name)
 python
 >>>

eval用法：可以接收之前定义的变量，结合input使用

 >>> eval('name')
 'python'
 >>> eval(input("please input your name:"))
 please input your name:name
 'python'

如果输入的是之前未定义的变量，将报错：

 >>> eval(input("please input your name:"))
 please input your name:lk
 Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "<string>", line 1, in <module>
 NameError: name 'like' is not defined
 >>> a = 5
 >>> eval(input("please input your name:"))
 please input your name: a
 5