and [True,True] --> [True, True]?????

["Martin v. Löwis"]

>> I prefer to write it explicitly:
>>
>> if len(lst) > 0:
>>    ...
> 
> At the very least, IMO you should write this as
> 
> if len(lst):
>     ...
> 
> There's no reason to be explicit about the numeric comparison.

I think in the mind-set that dislikes relying on boolean conversion
of lists, relying on boolean conversion of numbers is just as evil.
In this mindset (IIUC), you *have* to have an expression that is
either True or False in a boolean test (if and while).

Regards,
Martin