[Python-Dev] PEP 548: More Flexible Loop Control (original) (raw)

R. David Murray rdmurray at bitdance.com
Wed Sep 6 12:34:00 EDT 2017

On Wed, 06 Sep 2017 15:05:51 +1000, Chris Angelico <rosuav at gmail.com> wrote:

On Wed, Sep 6, 2017 at 10:11 AM, R. David Murray <rdmurray at bitdance.com> wrote: > I've written a PEP proposing a small enhancement to the Python loop > control statements. Short version: here's what feels to me like a > Pythonic way to spell "repeat until": > > while: > > break if > > The PEP goes into some detail on why this feels like a readability > improvement in the more general case, with examples taken from > the standard library: > > https://www.python.org/dev/peps/pep-0548/

Is "break if" legal in loops that have their own conditions as well, or only in a bare "while:" loop? For instance, is this valid? while not foundthethingwewant: data = sock.read() break if not data process(data)

Yes.

Or this, which uses the condition purely as a descriptor:

while "moar socket data": data = sock.read() break if not data process(data)

Yes.

Also - shouldn't this be being discussed first on python-ideas?

Yep, you are absolutely right. Someone has told me I also missed a related discussion on python-ideas in my searching for prior discussions. (I haven't looked for it yet...)

I'll blame jet lag :)

--David

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