Execute loop only once if condition is met

I was wondering if there is a pythonic way to write a code equivalent to the one below without defining doSomething as a separate function.

if test:
    for i in s:

In particular, I am thinking of the use case where test checks if s exists.

Any suggestions?

Read more here: https://stackoverflow.com/questions/67391153/execute-loop-only-once-if-condition-is-met

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