Equating with logical operators in Python

logical.py

>>> out = 'bar' or 'foo'
>>> out
'bar'

>>> bar = False
>>> out = bar or 'foo'
>>> out
'foo'

>>> bar = None
>>> out = bar and 'foo'
>>> print out
None

>>> out = 'foo' and 'bar' and 'tar'
>>> out
'tar'