String Validation after input or raw_input in Python

Question

I'd like to test an inputted string against certain conditions. In this instance, I want the string from the variable to contain at least one numeric character...

while any(inputted.isdigit()) == False:
    print ("Inputted must contain at least one numeric character") # can't figure this one out
    inputted = input("Please enter a combination: ")

An ideal input would be a string like "Boat88Sea"

Any help would be greatly appreciated!

Can you please give an example of what kind of inputs you are giving? What is a typical example of what is in inputted — idjaw
– idjaw, Commented Apr 4, 2016 at 3:04

Reblochon Masque · Accepted Answer · 2016-04-11 12:50:06Z

4

You must iterate over the input string:

input_string = "" 
while any(c.isdigit() for c in input_string) == False:
    print ("the input string must contain at least one numerical character") 
    input_string = input("Please enter a combination: ")

The moment any character in the string is found to be a digit, the while loop will exit.

Alternatively, this might read even closer than what you want:
As long as not any character is a digit in the input string...

while not any(c.isdigit() for c in inputted):

edited Apr 11, 2016 at 12:50

answered Apr 4, 2016 at 3:09

Reblochon Masque

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2 Comments

Tadhg McDonald-Jensen Over a year ago

you don't need the square brackets, you can just use a generator instead of a list.

Reblochon Masque Over a year ago

Correct, thank you; I changed it - but I doubt it makes much of a difference, it is unlikely the input will be large.

SDBot · Accepted Answer · 2016-04-04 03:17:56Z

1

There are definitely better way than this :

cond = True
while cond:
    print ("Inputted must contain at least one numeric character") 
    inputted = input("Please enter a combination: ")
    for x in range(0,9) : 
        if str(x) in inputted : cond = False

answered Apr 4, 2016 at 3:17

SDBot

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