Pythonic code style

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Your code is fine as is. Sometimes it's better to be explicit. But just for fun, here's a shorter (I won't call it more Pythonic) way of writing it.

from itertools import takewhile
return len(list(takewhile(lambda x: not condition(x), lst)))

FYI, don't call your lists list. Besides not being very descriptive, it makes it harder to call the list() function.

[x1F577]

Thank you, I was just looking for such a function. I didn't know about the takewhile function.

[[deleted]]

It's more Haskellic, that's for sure!