Counter doesn't QUITE do the same thing as this `mdict`.  But it's pretty close.

I think if .__add__() became a synonym for .update() that wouldn't break anything that currently works.  But I'm probably wrong, and missing a case in my quick thought:

>>> from collections import Counter

>>> c = Counter(a=[2], b='a')

>>> c.update(c)

>>> c

Counter({'a': [2, 2], 'b': 'aa'})

>>> c2 = Counter(a=1, b=2)

>>> c2 + c2

Counter({'b': 4, 'a': 2})

>>> c2.update(c2)

>>> c2

Counter({'b': 4, 'a': 2})

>>> c + c

Traceback (most recent call last):

  File "<ipython-input-18-e88785f3c342>", line 1, in <module>

    c + c

  File "/anaconda3/lib/python3.6/collections/__init__.py", line 705, in __add__

    if newcount > 0:

TypeError: '>' not supported between instances of 'list' and 'int'

On Tue, Oct 30, 2018 at 6:54 PM Alexander Belopolsky <alexander.belopolsky@gmail.com> wrote:

> In [12]: a= mdict(a=[2], b='a')
> In [13]: a+a

Aren't you reinventing the Counter type?

>>> from collections import Counter

>>> c = Counter(a=1,b=2)

>>> c + c

Counter({'b': 4, 'a': 2})

_______________________________________________
Python-ideas mailing list
Python-ideas@python.org
https://mail.python.org/mailman/listinfo/python-ideas
Code of Conduct: http://python.org/psf/codeofconduct/

--

Keeping medicines from the bloodstreams of the sick; food
from the bellies of the hungry; books from the hands of the
uneducated; technology from the underdeveloped; and putting
advocates of freedom in prisons.  Intellectual property is
to the 21st century what the slave trade was to the 16th.