[Python-ideas] JavaScript-Style Object Creation in Python (using a constructor function instead of a class to create objects)

Ivan Levkivskyi levkivskyi at gmail.com
Wed May 17 12:48:25 EDT 2017


On 17 May 2017 at 18:38, Stephan Houben <stephanh42 at gmail.com> wrote:

> Hi Sven,
>
> > But even given that (and I am only speaking for my team), I haven't even
> > seen a use-case for namedtuples in a year. Every time we considered it,
> > people said: "please make it its own class for documentary purposes; this
> > thing will tend to grow faster than we can imagine".
>
> Using namedtuple doesn't stop the class from being its "own class".
> Typical use case:
>
>  class Foo(namedtuple("Foo", "bar "baz"), FooBase):
>       "Foo is a very important class and you should totally use it."""
>
>        def grand_total(self):
>             return self.bar + self.baz
>


And the right (modern) way to do this is

from typing import NamedTuple

class Foo(NamedTuple):
    """Foo is a very important class and
    you should totally use it.
    """
    bar: int
    baz: int = 0

    def grand_total(self):
        return self.bar + self.baz

typing.NamedTuple supports docstrings, user-defined methods, and default
values.

--
Ivan
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