How to validate python raw_input for digits

Question

# Validating for only numbers in python one after another(in sequence)

a = raw_input()

#if a is a number then it should take next raw_input i.e., 'b' else it should ask for 'a' again

b = raw_input()

#if b is a number then it should take next raw_input i.e., 'c' else it should ask for 'b' again

c = raw_input()

#if c is a number then it should take next raw_input i.e., 'd' else it should ask for 'c' again

## This should be done upto 'e'

score 1 · Answer 1 · answered Apr 21 '16 at 18:27

1

use a.isdigit() to validate string a is digit or not

str.isdigit() Return true if all characters in the string are digits and there is at least one character, false otherwise.

answered Apr 21 '16 at 18:27

Haifeng Zhang

30,077
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what about if it is a float value – Annas Lee Apr 21 '16 at 18:42
@AnnasLee good catch. If your number contains dot(.) or slash(/) and so on, you can remove those characters and check. for example `"1.1".replace(".", "").isdigit()` – Haifeng Zhang Apr 21 '16 at 18:46

score 0 · Accepted Answer · edited May 23 '17 at 11:52

0

Make use of if..else construct for the conditional checks and refer this post for the integer check.

Edit 1

I have not executed it,but you could try the following and see if it works-

def ask(text):
    temp = raw_input(text)
    try:
        retVal = int(temp)
        return retVal
    except ValueError:
        return False

a = False
b = False
c = False

while not a:
    a = ask("Enter A:")
    if a == False:
        continue
    while not b:
        b = ask("ENter B:")
        if b == False:
            continue
        while not c:
            c = ask("Enter C:")

edited May 23 '17 at 11:52

Community

1
1

answered Apr 21 '16 at 18:28

Mayur Buragohain

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1
22
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Hi, Mayur Buragohain. Can you please code it from 'a' to 'e' raw_input. I am unable to do it! – Annas Lee Apr 21 '16 at 18:32
Do accept the answer if it answered your query. – Mayur Buragohain Apr 21 '16 at 19:09

How to validate python raw_input for digits

2 Answers2