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Wed Oct 25 17:29:50 EDT 2017 · https://mail.python.org/pipermail/python-dev/2017-October/149960.html

On Wed, Oct 25, 2017, at 16:32, Alexander Belopolsky wrote:
> This is annoying when you deal with time
> series where it is common to have text files with a mix of dates,
> timestamps and numbers.  You can write generic code to deal with ints
> and floats, but have to special-case anything time related.

Generic code that uses a Callable[[str], ...] instead of a type works
fine with a class method.

column1.parser = int
column2.parser = float
column3.parser = datetime.parse_iso
column4.parser = json.loads

It is *very slightly* more complex than a model that needs the type also
for some reason and has the type pull double duty as the parser... but
why do that?

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[Python-Dev] iso8601 parsing