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... )
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