Coding style

[Bruno Desthuilliers]

tac-tics wrote:
> dwelch91 wrote:
> 
>>tac-tics wrote:
>>
>>>I'd say the second one. Empty lists are not false. They are empty. Long
>>>live dedicated boolean data types.
>>>
>>
>>Uh, no, empty lists are False in a boolean context:
>>
>>http://docs.python.org/lib/truth.html
>>
>>-Don
> 
> 
> Perhaps I should have specified it like this:
> 
> 
>>>>empty_list = []
>>>>empty_list is not False
> 
> True

Physical identity is not structural equality.


> I'm well aware that both of these snippets does the same thing. I'm
> just spouting my opinion that lists and integers are not tests, and in
> an ideal world (Java??? X-) 

You naughty troll

> if statements support only boolean types.

if statements supports only boolean *expressions*. An expression is
boolean if it's result can be coerced to a boolean value, ie fed to the
bool type's constructor. So your example is wrong wrt/ if statements -
it should read:

empty_list = []
bool(empty_list) is False
=> True


-- 
bruno desthuilliers
python -c "print '@'.join(['.'.join([w[::-1] for w in p.split('.')]) for
p in 'onurb at xiludom.gro'.split('@')])"