I love assert

Chris Angelico rosuav at gmail.com
Wed Nov 12 03:44:10 CET 2014


On Wed, Nov 12, 2014 at 1:35 PM, Ben Finney <ben+python at benfinney.id.au> wrote:
> The more things people need to keep in mind when reading my code that
> isn't stated explicitly in the code, the worse I consider the code to
> be.

Then the ternary if/else operator should also be abolished.

track["APIC:"].data if "APIC:" in track else None

(With PEP 463, this would be:
track["APIC:"].data except KeyError: None
But this is from Python 2.7 code, so that was never going to happen anyway.)

When you read the if/else version, you need to remember that it's
evaluated middle-to-outside rather than outside-to-inside, and more
importantly, that the first expression won't be evaluated at all if
the key isn't present. So should we treat if/else as a "clever but
obfuscatory trick, opposed to that property of Python" too? Or should
people just get to know the language they're using? At least with
'assert', it's consistent across all Python programs; with my DEBUG
example, it's per-project, as it's custom crafted.

ChrisA



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