Question

如何在python中获取特定输入，例如

variable = input() 
if variable == "Specific input":
    do stuff

我需要输入为X或O

这两个选项之一

Answer 1

使用特定变量的简单示例：这是在Inch-to-Cm或Cm-to-Inch之间转换的简单代码：

conv = input("Please Type cm or inch?")
if conv == "cm" :
    number = int(input("Please Type Your number: "))
    inch = number*0.39370
    print(inch)
elif conv == "inch":
    number = int(input("Please Type Your Number?"))
    cm = number/0.39370
    print(cm)
else:
    print("Wrong Turn!!")

Answer 2

定义列表

specific_input = [0, 'x']

等等

if variable in specific_input:
    do awesome_stuff

Answer 3

我更理解关于循环相关输入的问题（正如@ SvbZ3r0在评论中指出的那样）。对于Python中的初学者来说，甚至很难从教程中复制代码，所以：

#! /usr/bin/env python
from __future__ import print_function

# HACK A DID ACK to run unchanged under Python v2 and v3+:
from platform import python_version_tuple as p_v_t
__py_version_3_plus = False if int(p_v_t()[0]) < 3 else True
v23_input = input if __py_version_3_plus else raw_input

valid_ins = ('yes', 'no')
prompt = "One of ({0})> ".format(', '.join(valid_ins))
got = None
try:
    while True:
        got = v23_input(prompt).strip()
        if got in valid_ins:
            break
        else:
            got = None
except KeyboardInterrupt:
    print()

if got is not None:
    print("Received {0}".format(got))

应该对python v2和v3保持不变（没有任何指示和Python v2中的input（）可能不是一个好主意......

在Python 3.5.1中运行上述代码：

$ python3 so_x_input_loop.py 
One of (yes, no)> why
One of (yes, no)> yes
Received yes

通过Control-C突破：

$ python3 so_x_input_loop.py 
One of (yes, no)> ^C

如果清楚，运行哪个版本，比如python v3，那么代码可能就像这样简单：

#! /usr/bin/env python

valid_ins = ('yes', 'no')
prompt = "One of ({0})> ".format(', '.join(valid_ins))
got = None
try:
    while True:
        got = input(prompt).strip()
        if got in valid_ins:
            break
        else:
            got = None
except KeyboardInterrupt:
    print()

if got is not None:
    print("Received {0}".format(got))

Answer 4

最简单的解决方案是：

variable = input("Enter x or y") acceptedVals = ['x','y'] if variable in acceptedVals: do stuff

或者，如果您想继续提示用户正确使用while循环 acceptedVals = ['x','y'] while variable not in acceptedVals variable = input("Enter x or y") do stuff

在python中获取特定输入

4 个答案: