No subject

[Nick Eubank]

Hello All,


Found an odd behavior I'd never known about today, not sure if it's a bug
or known. Python 3.4.4 (anaconda).

True, False, 0, 1 can all be used as dictionary keys.

But Apparently True and 1 hash to the same item and False and 0 hash to the
same item, so they can easily overwrite (which I spent a while banging my
head over today).

In other words:

 In[1]:
     d = {True: 'a', False: 'b'}
     d[0] = 'z'
     d[False]

Out[1]:
     'z'

I understand that True and False are sub-types of ints, but it's not clear
to me why (i.e. certainly didn't feel intuitive) that they would be treated
the same as keys.

Relatedly, if this is a desired behavior, any advice one how best to work
with dictionaries when one wants "True" and 1 to be different? I'm working
on a function that accepts arguments that may be "True" or 1 (meaning very
different things) and am seeking a pythonic solution...