inheriting from long on Python2 or int on Python3

[duncan smith]

On 21/03/2020 21:55, Skip Montanaro wrote:
>> import sys
>>
>> class C_hash(int if sys.version_info.major >= 3 else long):
> ...
> 
> There's nothing incorrect with your solution. Chris offered another. I
> was going to suggest you consider running your code through 2to3 to
> see what it does. I created a C_hash class similar to yours:
> 
> class C_hash(long):
>     def __new__(cls, bits, m, N=1):
>         obj = super(C_hash, cls).__new__(cls, bits)
>         obj._m = m
>         obj._N = N
>         return obj
> 
>     def meth(self):
>         pass
> 
> When I ran it through 2to3, it didn't make any transformations, which
> I thought odd. Still, assuming I did something wrong, you might poke
> around with it a bit to see if you can get it to do the work for you.
> 
> Skip
> 

According to the docs (https://docs.python.org/2/library/2to3.html) it
should have renamed long to int. I also tried something closer to
Chris's suggestion,


try:
    long
except NameError:
    long = int

class C_hash(long):
    # etc.


but (tentatively) opted for something that avoided creating new names at
the module level. If it doesn't look too terrible I might stick with it
for now (although I am quite tempted to go back to the above). Thanks
Skip and Chris.

Duncan