Re: [Python-Dev] PEP 548: More Flexible Loop Control

On Wed, Sep 6, 2017 at 10:11 AM, R. David Murray rdmurray@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:
    <do stuff>
    break if <done condition>

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 found_the_thing_we_want: data = sock.read() break if not data process(data)

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

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

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

ChrisA