Break out of while loop within an if statement in an function

Question

I am currently stuck on something I am trying to break out of a while loop that is like this

while True
    if blah blah
        function()
        if blah blah:
            #break while loop

I tried a lot of methods but I can't seem to get it working, can anyone teach me?

EDIT: I fixed the example I typed above.

break However, I would write this code differently, flag = True while flag: "do stuff" if blah blah: flag = False — idnavid
– idnavid, Commented Sep 25, 2018 at 1:04
possible duplicate of stackoverflow.com/questions/42318622/… — Henry
– Henry, Commented Sep 25, 2018 at 1:04
just add break to that if. I think you meant something else so show us the real code because this example is most likely not what you intended it to be — Danilo Souza Morães
– Danilo Souza Morães, Commented Sep 25, 2018 at 1:04
What do you mean by "in a function"? Is the if condition actually inside function()? Because that's a more difficult and more interesting question than the one posed. — John Kugelman
– John Kugelman, Commented Sep 25, 2018 at 1:06
break should do what you want. If it doesn't post a minimal reproducible example of actual Python code that reproduces your issue. — PM 2Ring
– PM 2Ring, Commented Sep 25, 2018 at 1:10

John Kugelman · Accepted Answer · 2018-09-25 01:04:43Z

0

That's exactly what a break statement does.

while True:
    function()
    if blah blah:
        break

Of course, if possible you should move the test to the loop condition.

while not blah blah:
    function()

answered Sep 25, 2018 at 1:04

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John Kugelman

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Comments

khachik · Accepted Answer · 2018-09-25 13:49:50Z

0

If you need to break the loop from "inside" the function, there are several ways of doing it:

return True/False from the function, and check the return value in the loop
raise a special exception from the function and catch it inside the loop

Examples:

# example 1
def function():
    if cloudy and not umbrella:
        print "no good to stay outside"
        return False
    return True

while nice_weather:
    if not function():
        break


# example 2
class RunHome(Exception):
    pass

def function():
    if thunderstorm:
        raise RunHome()

while enjoying:
    try:
        function()
    except RunHome as re:
        break

Depending on what actually the function and the loop do, some other techniques may be suitable as well.

edited Sep 25, 2018 at 13:49

answered Sep 25, 2018 at 1:15

khachik

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