How to use python input

The input() function in Python3.x accepts a standard input data and returns it as string type.

In Python2.x, input() is equivalent to eval(raw_input(prompt)), which is used to obtain console input.

#raw_input() treats all input as strings and returns the string type. (Recommended learning: Python Video Tutorial)

And input() has its own characteristics when dealing with pure numeric input. It returns the type of the input number (int, float).

Note: Both functions input() and raw_input() can receive strings, but raw_input() directly reads the input from the console (any type of input can be take over). As for input(), it hopes to be able to read a legal python expression, that is, you must use quotes to enclose it when you enter a string, otherwise it will raise a SyntaxError.

Unless there is a special need for input(), we generally recommend using raw_input() to interact with users.

Note: input() in python3 receives the str type by default.

Function syntax

input([prompt])

Parameter description:

prompt: 提示信息

Python2.x: input() requires python input Expression

>>>a = input("input:")
input:123                  # 输入整数
>>> type(a)
<type &#39;int&#39;>               # 整型
>>> a = input("input:")    
input:"runoob"           # 正确，字符串表达式
>>> type(a)
<type &#39;str&#39;>             # 字符串
>>> a = input("input:")
input:runoob               # 报错，不是表达式
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<string>", line 1, in <module>
NameError: name 'runoob' is not defined
<type &#39;str&#39;>

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