Question About Logic In Python

[Steven D'Aprano]

On Mon, 19 Sep 2005 12:16:15 +0200, sven wrote:

> to make sure that an operation yields a boolean value wrap a bool() 
> around an expression.
> None, 0 and objects which's len is 0 yield False.
> so you can also do stuff like that:

Are there actually any usage cases for *needing* a Boolean value? Any
object can be used for truth testing, eg:

if the_str

is to be preferred over:

if bool(the_str)

or even worse:

if bool(the_str != "")

Or wait, I have thought of one usage case: if you are returning a value
that you know will be used only as a flag, you should convert it into a
bool. Are there any other uses for bool()?



-- 
Steven.