Python 基础之二用户交互input

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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