How to continue loop until true

Question

I am attempting to get a correct input but whilst the input is false I want it to continually ask again until the output is correct, how do I correctly do this?

x = input("Enter your string")
if set(x).issubset({'m', 'u', 'i'}):
    print("true")
else:
    print("false")
    x = input("Enter your string")

Jérôme · Accepted Answer · 2017-05-24 21:05:24Z

5

while not set(input("Enter your string")).issubset({'m', 'u', 'i'}):
    print("false")
else:
    print("true")

edited May 24, 2017 at 21:05

answered Apr 18, 2016 at 14:47

Jérôme

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3 Comments

Tadhg McDonald-Jensen Over a year ago

"just use the not operator and a while loop" might be worth adding to this answer since it is not immediately obvious.

Timothy Kardaras Over a year ago

Of course, that makes complete sense, is it common to create the true section in the else part of the statement?

Jérôme Over a year ago

I don't think it is uncommon, really. Thinking of it, it is just a condition. You can negate it to invert True or False. In fact, the not is not needed here, you could have the print("true") in the if and the other branch in the else. It is just a matter of readability / preference.

Quinn · Accepted Answer · 2016-04-18 15:00:28Z

1

This should do also:

while not set(input("Enter your string")).issubset({'m', 'u', 'i'}):
    print("false")
print("true")

answered Apr 18, 2016 at 15:00

Quinn

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