Getting a input to only accept something from a string Python

Question

My Python code is trying to take the inputs that the user has given and give them back but in line 5 I want the user to only be able to write either m or f and nothing else so I looked up if python had a char data type like c++ but it doesn't so I kept looking and people said that you could use strings as a data type but I don't know how to implement that so I hope you guys can help enlighten me.

Here is the link to the code the important parts are 4 and 5. What is written was more of a guess.

#Input your information
name = input("Enter your Name: ")
surname = input("Enter Surname: ")
str(m,f)
gender = str(input("What is your gender?(m,f)")
height = input("Enter your Height: ")
 
#Print your information
print("\n")
print("Printing Your Details")
print("Name", "Surname", "Age","Gender","Height")
print( name, surname, age, gender, height)

result of input already is of type str, no need to "convert" it — Jan Stránský
– Jan Stránský, Commented Sep 23, 2020 at 20:10

Jan Stránský · Accepted Answer · 2020-09-23 20:13:42Z

2

If you want the user to have multiple "tries", use the if condition proposed in other answers inside a loop, e.g. while True: loop

while True:
    gender = input("What is your gender?(m,f)")
    if gender in ("m","f"):
        break
    print("Invalid gender input!")
print("Gender is",gender)

answered Sep 23, 2020 at 20:13

Jan Stránský

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1 Comment

Jack Over a year ago

Thank you for the quick response. And I hope you have a good day.

Roim · Accepted Answer · 2020-09-23 20:14:58Z

1

You want to condition the input: if the the input is something, then it's okayif not then... That's why you can useifstatement. just ask ifgenderisform`

if gender is in ['m', 'f']
    # Valid Answer
else
    # Not Valid Answer

In this code I put 'm' and 'f' in a list, and ask if gender (user response) is inside the list, means if it is m or f

Edit: As suggested in comment, a better version will be:

if gender.lower() in ['m', 'f']
    # Valid Answer
else
    # Not Valid Answer

which change gender to lower case and then compare it to 'm' or 'f', just to make sure you do not want case sentensive

edited Sep 23, 2020 at 20:14

answered Sep 23, 2020 at 20:11

Roim

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2 Comments

TayTay Over a year ago

No need for the is. Also, for a case like this you might want to support uppercase too, so might want to check if gender.lower() in ['m', 'f']

Jack Over a year ago

Thanks for the fast response

Yannick Funk · Accepted Answer · 2020-09-23 20:10:26Z

0

Just check an input condition:

gender = input("What is your gender?(m,f)")
if gender not in ["m", "f"]:
    print("Invalid gender input!")

answered Sep 23, 2020 at 20:10

Yannick Funk

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1 Comment

Jack Over a year ago

Thank you very much I will remember this for further projects.

0-1 · Accepted Answer · 2020-09-23 20:45:48Z

0

If you're going continue asking multiple choice questions, here's a special method you may use:

def choices(message, m):
    print(message)
    print('Choices:')
    for i in m:
        print(' -', i)
    while True:
        chosen = input('Input Here: ')
        if chosen in m:
            break
        print('Invalid.')
    print('Great choice:', chosen, '\n')
    return chosen


gender = choices('What is your gender?', ['m', 'f'])
color = choices('What is your favorite color?', ['red', 'green', 'blue'])
foobar = choices('Which do you use more?', ['foo', 'bar'])

I've also taken an artistic liberty to ask for a choice of favorite colors.

edited Sep 23, 2020 at 20:45

answered Sep 23, 2020 at 20:32

0-1

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1 Comment

Jack Over a year ago

Thank you very much Ill be sure to try it out.

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