如何在python 2.7中将用户输入转换为字符串
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How to convert user input to string in python 2.7
提问by sarang.g
When I enter
当我进入
username = str(input("Username:"))
username = str(input("Username:"))
password = str(input("Password:"))
password = str(input("Password:"))
and after running the program, I fill in the input with my name and hit enter
运行程序后，我用我的名字填写输入并按回车
username = sarang
username = sarang
I get the error
我收到错误
NameError: name 'sarang' is not defined
NameError: name 'sarang' is not defined
I have tried
我试过了
username = '"{}"'.format(input("Username:"))
username = '"{}"'.format(input("Username:"))
and
和
password = '"{}"'.format(input("Password:"))
password = '"{}"'.format(input("Password:"))
but I end up getting the same error.
但我最终得到了同样的错误。
How do I convert the input into a string and fix the error?
如何将输入转换为字符串并修复错误？
回答by jDo
Use raw_input()in Python 2.x and input()in Python 3.x to get a string.
使用raw_input()在Python 2.x和input()Python中3.X得到一个字符串。
You have two choices: run your code via Python 3.x or change input()to raw_input()in your code.
您有两种选择：通过 Python 3.x 运行您的代码或在您的代码中更改input()为raw_input()。
Python 2.x input()evaluates the user input as code, not as data. It looks for a variable in your existing code called sarangbut fails to find it; thus a NameErroris thrown.
Python 2.xinput()将用户输入评估为代码，而不是数据。它会在您调用的现有代码中查找变量，sarang但找不到；因此 aNameError被抛出。
Side note: you could add this to your code and call input_func()instead. It will pick the right input method automatically so your code will work the same in Python 2.x and 3.x:
旁注：您可以将其添加到您的代码中并input_func()改为调用。它将自动选择正确的输入法，因此您的代码在 Python 2.x 和 3.x 中的工作方式相同：
input_func = None
try:
input_func = raw_input
except NameError:
input_func = input
# test it
username = input_func("Username:")
print(username)
Check out this questionfor more details.
查看此问题了解更多详情。
回答by Rochak Bhalla
You have to explicitly use raw_input(prompt), instead of just using input(prompt). As you are currently using Python 2.x which supports this type of formatting for receiving an input from user.
您必须显式使用 raw_input(prompt)，而不仅仅是使用 input(prompt)。由于您目前使用的是 Python 2.x，它支持这种格式以接收用户输入。
回答by Akash Kandpal
In Python 2, raw_input()returns a string, and input()tries to run the input as a Python expression.
在 Python 2 中，raw_input()返回一个字符串，并input()尝试将输入作为 Python 表达式运行。
Since getting a string was almost always what you wanted, Python 3 does that with input().
由于获取字符串几乎总是您想要的，因此 Python 3 使用input().
