CODEWITHSUNDEEP
pythonexceptioninput
FaRi
FaRi

Reputation: 13

Python- Do not want letters or numbers outside of range input

I want the program to only allow the numbers 1-4 to be used as input and not any letters or numbers outside of that range. This is the code I have right now but it is not working:

 # Get the user's choice.
 choice = int(input("what would you like to do ? "))

 # Validate the choice.
 while choice < 1 or choice > 4:
    try:
        choice = int(raw_input("Enter a valid choice: "))
    except ValueError:
        print ("Please enter a numeric value.")

 # return the user's choice.
 return choice

Upvotes: 1

Views: 940

Answers (3)

GLHF
GLHF

Reputation: 4035

Here is your solution

while True:
    try:
        choice = int(input("what would you like to do ? "))
    except ValueError:
        print ("Invalid choice.Valid choises are between 1-4.")
        continue
    if choice<1 or 4<choice:
        print ("Invalid choice.Valid choises are between 1-4.")
        continue
    else:
        print ("some codes will work on here..")

Upvotes: 1

Hackaholic
Hackaholic

Reputation: 19733

try like this:

def get_choice():
    while True:
        choice = raw_input("Enter a valid choice between 1 and 4: ")
        if choice.isdigit():
            if 1<= int(choice) <=4:
                print choice
                return choice
        else:
            print ("Please enter a numeric value.")

str.isdigit() : check for if the string is digit or not, if digit return True else False

Upvotes: 0

Amar Kalabić
Amar Kalabić

Reputation: 898

You can try something like this:

 def ask():
     # Get the user's choice.
     choice = raw_input("what would you like to do ? "))
     return choice

 #you can put this in while True infinite loop if you want it to ask again and again
 choice = ask()

 # Validate the choice.
 if choice.isdigit():
    if (choice > 0) and (choice < 5):
        print choice
    else:
        print "Input must be between 1 and 4!"
 else:
    print "Input must be digit!"

Using isdigit() you check if string is digit. It returns True or False. Here's some doc:

https://docs.python.org/2/library/stdtypes.html#str.isdigit

I hope this helps and fits ur needs ;)

Upvotes: 0

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