Validating a users input

Question

I'm fairly new to Python and I'm using a while True loop. Inside that loop I have

Sentence= input("please enter a sentence").lower().split()

However I want to create validation so an error message appears when the user inputs a number instead of a letter. I was researching and saw the use of .isalpha. Would anyone where this would go in the whie true loop to create and error message for inputting numbers?

See: http://stackoverflow.com/questions/39488787/what-is-the-canonical-way-to-check-the-type-of-input/39489028#39489028 — Laurent LAPORTE, Sep 19 '16 at 15:04

score 1 · Answer 1 · answered Sep 19 '16 at 15:04

1

sentence = input("please enter a sentence").lower().split()
for word in sentence:
    if not word.isalpha():
        print("The word %s is not alphabetic." % word)

answered Sep 19 '16 at 15:04

John Gordon

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Thank you I completely get it! Is there a way to keep repreating the question until letters are inputted? – Codee Sep 19 '16 at 15:15

score 0 · Answer 2 · answered Sep 19 '16 at 15:29

0

Something like this?

sentence = input("please enter a sentence: ").lower().split()

while False in [word.isalpha() for word in sentence]:
    sentence = input("Do not use digits. Enter again: ").lower().split()

answered Sep 19 '16 at 15:29

nauer

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Validating a users input

2 Answers2