"Guba" <[EMAIL PROTECTED]> wrote
> >>> string1, string2, string3 = '', 'Trondheim', 'Hammer Dance'
> >>> non_null = string1 or string2 or string3
> >>> non_null
> 'Trondheim'
>
> How does this work?? How does Python know that we are looking for
> non_null? After all, we don't provide this informa
On Thu, Mar 20, 2008 at 04:55:17PM -0700, jim stockford wrote:
> >>> string1, string2, string3 = '', 'Trondheim', 'Hammer Dance'
> >>> jackson = string1 or string2 or string3
> >>> jackson
> 'Trondheim'
The key here is the "or" operator which, in an expression like
a or b
will return a if
i'm guessing assignment, which actually associates
a reference, will skip referencing an identifier to a null
and will make the association (assignment) to the first
non-null value in the expression, which is string2 in
this case. that the identifier is non_null is immaterial;
you could write
Dear list,
from Guido's tutorial:
It is possible to assign the result of a comparison or other Boolean
expression to a variable. For example,
>>> string1, string2, string3 = '', 'Trondheim', 'Hammer Dance'
>>> non_null = string1 or string2 or string3
>>> non_null
