A certainl part of an if() structure never gets executed.

[Νικόλαος Κούρας]

On 12/6/2013 8:53 μμ, MRAB wrote:

>> and then what this is doing?
>>
>> if '=' not in ( name or month or year ):
>>
> In English, the result of:
>
>      x or y
>
> is basically:
>
>      if bool(x) is true then the result is x, otherwise the result is y
>
> For example:
>
>  >>> bool("")
> False
>  >>> "" or "world"
> 'world'
>  >>> bool("Hello")
> True
>  >>> "Hello" or "world"
> 'Hello'
>
> These can be strung together, so that:
>
>      x and y and z
>
> is equivalent to:
>
>      (x and y) and z
>
> and:
>
>      x or y or z
>
> is equivalent to:
>
>      (x or y) or z
>
> and so on, however many times you wish to do it.
>
>> Never before i used not in with soe many variables in parenthesi, up
>> until now i was specified it as not in var 1 and not in var 2 and not in
>> var 2 and so on....
>>
> Keep it simple:
>
>      if '=' not in name and '=' not in month and '=' not in year:
>
> There may be a shorter way, but you seem confused enough as it is.
>

Whn i see:

if( x and y ):
i understand: if x expression = True AND ALSO y expression = True then 
execute


if( x or y ):
i understand: if x expression = True OR y expression = True then execute


if '=' not in ( name and month and year ):
i understand: if '=' not in name AND '=' not in month AND '=' not in year


if '=' not in ( name or month or year ):
i understand: if '=' not in name OR '=' not in month OR '=' not in year


but i know it does not work like this, but tis is how i understand it. 
its like reading an English sentence