"Good Z" <goodz158@yahoo .comwrote in message
news:706397.160 40.qm@web35903. mail.mud.yahoo. com...
| Hello,
| I am having problem in using is. Here is what i am doing.
|
| x=''
| if x is None or x is '':
| return 1
x is not the singleton value None, nor is it the newly created null string
object. It is up to the implementation whether each instance of '' reuses
one cached (or interned) null string object or creates another. Don't
depend on such behavior unless you really mean it. Same goes for comparing
ints.
|
| The above statement does not return value 1.
|
| If i changed the above check to
| if x == None or x == '':
| return 1
| Now it works fine.
x still is not None but does equal in value ''
I recommend here
if x is None or x == '': ...
tjr