Comparisons and sorting of a numeric class....

Tue Jan 6 21:53:23 EST 2015

On 01/06/2015 06:34 PM, Terry Reedy wrote:
> On 1/6/2015 9:01 PM, Andrew Robinson wrote:
>> [snip]
>> There are very few (about 4) builtin classes that cannot be 
> subclassed. bool is one of those few, float is not. Go ahead and 
> subclass it.
>> >>> class F(float): pass
>> >>> F
> <class '__main__.F'>
> >>> F(2.3) + F(3.3)
> 5.6
>>Thanks terry! That's a relief. Ive just managed to find a few classes 
that won't subtype by trial and error in the last two months and was 
getting pessimistic. ( eg: doing web pages I wanted to customize the 
error output traceback stack from a python script based on where the 
exception occurred..... UUUUGH! I worked around the no sub-typing 
issue, but it took a lot of guessing to trick python into accepting a 
fake class to the print traceback functions the webserver used... )