First uncategorized solution for Parity Bit Generator by Moff - python coding challenges

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First solution in Uncategorized category for Parity Bit Generator by Moff

def checkio(n):
    return ''.join(chr(c >> 1) for c in n if '{:b}'.format(c).count('1') & 1 == 0)

Sept. 8, 2015

Comments:

veky on March 3, 2016, 2:02 p.m.
I'm always sad when I see people think that format is only a method. It is a builtin function, too. <pre class='brush: python'>format(c, 'b') </pre>

Moff on March 4, 2016, 6:41 a.m.
I always use `format` as method because often is need to change output using multiple arguments (testing and production).

veky on March 4, 2016, 7:24 a.m.
Hmm... now that I read this, I see an important point. In fact, those are two functions with a similar name, but really serving subtly separate purposes. str.format is indispensable (at least until Py3.6 and formatstrings come along:) for constructing beautiful output for human readers. And there you have a point: in most cases you really need something more flexible, with the ability to finetune the "surroundings" around your formatted data. I won't argue that. But for programmatic access (what you're doing here), I'd argue that format builtin is better. It doesn't distract the reader with unnecessary "surroundings" `"{:b}"` which are in fact empty, and their whole point is to be empty, to get out of the way so .count can do its job. It's not often that we need programmatic access to formatted strings (I remember three times in my career, one of them being a CheckiO mission:) - so of course str.format is much more used, and it should be. But it's nice to keep in mind that for a slightly separate purpose, format builtin might be better.

Moff on March 4, 2016, 8:03 a.m.
Thanks, i'll take into account for future participation.

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