How do i stop this while loop in python

Question

How do I stop this while loop?

Sentence = input("Please enter the sentence: ").lower()

if "." in Sentence or "'" in Sentence or "," in Sentence or ";" in Sentence or ":" in Sentence or "/" in Sentence or "?" in Sentence or "!" in Sentence or "-" in Sentence:  
    while Sentence:
        print("Your sentence is invalid. Please enter the sentence without punctuation") 
else:
    allWords = Sentence.split()

    print(allWords)

    FindWord = input("Enter the word you are looking for: ").lower()
    for L in range(len(allWords)):
        if FindWord == allWords[L]:
            print("The word <", FindWord, "> is found in", L,"th positions")

Please read documentation on How ask a good question : http://stackoverflow.com/help/how-to-ask — Essex, Dec 15 '16 at 18:45

score 1 · Answer 1 · answered Dec 15 '16 at 18:48

Use the break keyword to break out of the loop when your condition is satisfied. Written a bit shorter, you can do something like

while True:
    Sentence = input("Please enter the sentence: ").lower()
    if any(c in Sentence for c in ".',;:/?!-"):
        print("Your sentence is invalid. Please enter the sentence without punctuation")
    else:
        # Accept input
        break

Andriy Ivaneyko · Answer 2 · 2017-01-05T16:45:39.637

1

Set Sentence to falsy value (False, '', 0) if you aren't going to re-use it.

edited Jan 05 '17 at 16:45

answered Dec 15 '16 at 18:54

Andriy Ivaneyko

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score -2 · Answer 3 · answered Dec 15 '16 at 18:45

Sentence=input("Please enter the sentence: ").lower()

while "." in Sentence or "'" in Sentence or "," in Sentence or ";" in Sentence or ":" in Sentence or "/" in Sentence or "?" in Sentence or "!" in Sentence or "-" in Sentence::    
    print("Your sentence is invalid. Please enter the sentence without punctuation") 
    Sentence=input("Please enter the sentence: ").lower()

Use the conditional to check whether to keep looping. and put a way to change Sentence in the loop

How do i stop this while loop in python

3 Answers3