python check string for emptieness - is this the elegant way [duplicate]

Question

if var is not None and var !="" and var !=" ":
   # todo

can I write it like this?:

if var: 
   # todo

var is only String type.

Answer 1

If you want to filter out space-only string (" "):

if var and var.strip():
    # ...

Becasue string that contain spaces is evaludated as True if used as predicate:

>>> bool("")
False

>>> bool("  ")
True