Get a specific input in python

Question

How do I get a specific input in python such as

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

I need the input to be one of two options say X or O

Can you be more specific about your question ? If you want to perform some operation only when the input is x or o you need to check for them. — Vinayak Kolagi, Jun 15 '16 at 04:48
What is wrong with your code? It should work just fine. You can't force a user to give you specific input. You can use a `while` loop to check if `variable` is one of `x` and `o`, else keep prompting for correct input. — SvbZ3r0, Jun 15 '16 at 04:48
Possible duplicate of [Asking the user for input until they give a valid response](https://stackoverflow.com/questions/23294658/asking-the-user-for-input-until-they-give-a-valid-response) — moooeeeep, Oct 08 '19 at 15:05

score 1 · Accepted Answer · edited Dec 21 '17 at 06:08

Its Simple Example to use specific Variable: This is Simple Code For Converting Between Inch-to-Cm OR Cm-to-Inch:

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!!")

score 0 · Answer 2 · answered Jun 15 '16 at 05:03

0

Define a list

specific_input = [0, 'x']

and so

if variable in specific_input:
    do awesome_stuff

answered Jun 15 '16 at 05:03

elm

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score 0 · Answer 3 · answered Jun 15 '16 at 05:16

I understand the question more on looping for relevant input (as @SvbZ3r0 has pointed out in comment). For a very beginner in Python it may be hard to even copy code from tutorials, so:

#! /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))

Should work on either python v2 and v3 unchanged (there was no indication in question and input() in Python v2 might not be a good idea ...

Running the above code in Python 3.5.1:

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

Breaking out via Control-C:

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

When it is clear, on which version to run, say python v3, than the code could be as simple as:

#! /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))

Sreejith Menon · Answer 4 · 2019-10-08T14:49:44.660

0

The simplest solution would be:

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

Or if you want to keep prompting the user for the right use a while loop variable = None acceptedVals = ['x','y'] while variable not in acceptedVals variable = input("Enter x or y") do stuff

edited Oct 08 '19 at 14:49

answered Jun 15 '16 at 06:31

Sreejith Menon

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Your second option will require you to define `variable` before your `while` statement or else you will get an error that says: `UnboundLocalError: local variable 'variable' referenced before assignment`, FYI. But it does work. – q-compute Aug 22 '19 at 21:08

Get a specific input in python

4 Answers4