How do I use a Boolean in Python?

checker = None if some_decision:    checker = Trueif checker:    # some stuff

[Edit]

For more information: http://docs.python.org/library/functions.html#bool

Your code works too, since 1 is converted to True when necessary.Actually Python didn't have a boolean type for a long time (as in old C), and some programmers still use integers instead of booleans.

The boolean builtins are capitalized: True and False.

Note also that you can do checker = bool(some_decision) as a bit of shorthand -- bool will only ever return True or False.

It's good to know for future reference that classes defining __nonzero__ or __len__ will be True or False depending on the result of those functions, but virtually every other object's boolean result will be True (except for the None object, empty sequences, and numeric zeros).

True ... and False obviously.

Otherwise, None evaluates to False, as does the integer 0 and also the float 0.0 (although I wouldn't use floats like that).Also, empty lists [], empty tuplets (), and empty strings '' or "" evaluate to False.

Try it yourself with the function bool():

bool([])bool(['a value'])bool('')bool('A string')bool(True)  # ;-)bool(False)bool(0)bool(None)bool(0.0)bool(1)

etc..