multiple conditions with while loop in python

Question

I am having problems including multiple statements with while loop in python. It works perfectly fine with single condition but when i include multiple conditions, the loop does not terminate. Am i doing something wrong here?

name = raw_input("Please enter a word in the sentence (enter . ! or ? to end.)")

final = list()

while (name != ".") or (name != "!") or (name != "?"):
    final.append(name)
    print "...currently:", " ".join(final)
    name = raw_input("Please enter a word in the sentence (enter . ! or ? to end.)")
print " ".join(final)

Martijn Pieters · Accepted Answer · 2014-10-26 21:42:09Z

4

You need to use and; you want the loop to continue if all conditions are met, not just one:

while (name != ".") and (name != "!") and (name != "?"):

You don't need the parentheses however.

Better would be to test for membership here:

while name not in '.!?':

answered Oct 26, 2014 at 21:42

Martijn Pieters

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Comments

khelwood · Accepted Answer · 2014-10-26 21:48:55Z

2

This condition:

(name != ".") or (name != "!") or (name != "?")

is always true. It could only be false of all three subconditions were false, which would require that name were equal to "." and "!" and "?" simultaneously.

You mean:

while (name != ".") and (name != "!") and (name != "?"):

or, more simply,

while name not in { '.', '!', '?' }:

edited Oct 26, 2014 at 21:48

answered Oct 26, 2014 at 21:43

khelwood

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