Bools and explicitness [was Re: PyWart: The problem with "print"]

[Steven D'Aprano]

On Thu, 06 Jun 2013 18:44:49 -0700, Mark Janssen wrote:

>>> Python has seduced us all into lazy typing.  That's what it is.
>>
>> Bulshytt. If you have no idea what polymorphism is, you shouldn't even
>> be participating in this conversation.
> 
> I am aware of what it means, but Python doesn't really have it (although
> it may evolve to it with annotations).

No polymorphism huh?


py> len([1, 2, 3])  # len works on lists
3
py> len((1, 2))  # and on tuples
2
py> len({})  # and on dicts
0
py> len('I pity the fool')  # and on strings
15
py> len(b'\x23')  # and on bytes
1
py> len(set(range(2)))  # and on sets
2
py> len(frozenset(range(4)))  # and on frozensets
4
py> len(range(1000))  # and on range objects
1000


Looks pretty polymorphic to me.




-- 
Steven