Python `input` 和 `raw_input` 之间的差异
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Differences between `input` and `raw_input`
提问by Guillermo Siliceo Trueba
In a tutorial, I read that that there is a difference between inputand raw_input. I discovered that they changed the behavior of these functions in the Python 3.0. What is the new behavior?
在教程中，我读到input和之间存在差异raw_input。我发现他们在 Python 3.0 中改变了这些函数的行为。什么是新行为？
And why in the python console interpreter this
为什么在 python 控制台解释器中这个
x = input()
Sends an error but if I put it in a file.py and run it, it does not?
发送错误，但如果我将它放在 file.py 中并运行它，它不会？
采纳答案by aaronasterling
In python 2.x, raw_input()returns a string and input()evaluates the input in the execution context in which it is called
在 python 2.x 中，raw_input()返回一个字符串并input()在调用它的执行上下文中评估输入
>>> x = input()
"hello"
>>> y = input()
x + " world"
>>> y
'hello world'
In python 3.x, inputhas been scrapped and the function previously known as raw_inputis now input. So you have to manually call compileand than evalif you want the old functionality.
在 python 3.x 中，input已被废弃，以前称为raw_input现在的函数input。因此compile，eval如果您想要旧功能，则必须手动调用。
python2.x python3.x
raw_input() --------------> input()
input() -------------------> eval(input())
In 3.x, the above session goes like this
在 3.x 中，上面的 session 是这样的
>>> x = eval(input())
'hello'
>>> y = eval(input())
x + ' world'
>>> y
'hello world'
>>>
So you were probably getting an error at the interpretor because you weren't putting quotes around your input. This is necessary because it's evaluated. Where you getting a name error?
因此，您可能在解释器中遇到错误，因为您没有在输入周围加上引号。这是必要的，因为它被评估。您在哪里收到名称错误？
回答by Blueice
input() vs raw_input()
input() 与 raw_input()
raw_input collects the characters the user types and presents them as a string. input() doesn't just evaluate numbers but rather treats any input as Python code and tries to execute it. Knowledgeable but malicious user could type in a Python command that can even deleted a file. Stick to raw_input() and convert the string into the data type you need using Python's built in conversion functions.
raw_input 收集用户键入的字符并将它们显示为字符串。input() 不只是计算数字，而是将任何输入视为 Python 代码并尝试执行它。知识渊博但恶意的用户可以输入甚至可以删除文件的 Python 命令。坚持使用 raw_input() 并使用 Python 的内置转换函数将字符串转换为您需要的数据类型。
Also input(), is not safe from user errors! It expects a valid Python expression as input; if the input is not syntactically valid, a SyntaxError will be raised.
还有 input()，对于用户错误是不安全的！它需要一个有效的 Python 表达式作为输入；如果输入在语法上无效，则会引发 SyntaxError。
回答by aniketectech
Its simple:
这很简单：
raw_input()returns string values- while
input()return integer values
raw_input()返回字符串值- while
input()返回整数值
For Example:
例如：
1.
1.
x = raw_input("Enter some value = ")
print x
Output:
输出：
Enter some value = 123
'123'
2.
2.
y = input("Enter some value = ")
print y
Output:
输出：
Enter some value = 123
123
Hence if we perform x + x =It will output as 123123
因此，如果我们执行x + x =它将输出为 123123
while if we perform y + y =It will output as 246
而如果我们执行y + y =它会输出为 246
