str.isspace()

[bearophileHUGS at lycos.com]

Are you using the str.isspace() method? I don't use it, so if most
people don't uses it, then it may be removed from Py 3.0.

I usually need to know if a string contains some non-spaces (not space
class chars). To do it I use something like:

if aline.strip(): ...

If you really need str.isspace() you may use (but so far I have never
had to do this):

if txt and not txt.strip(): ...

Bye,
bearophile