[Python-ideas] Two small functional-style-related improvements

Sun Mar 27 04:30:41 CEST 2011

Hello.
IMHO it'd be nice...
1. ...to add:
* operator.is_none -- equivalent to (lambda x: x is None))
* operator.is_not_none -- equivalent tolambda x: x is not None))
...making using 'is None'/'is not None' tests with any(), all(),
filter(), itertools.takewhile/dropwhile() more convenient and readable
(possibly also optimised for speed).
2. ...to add:
* operator.anti_caller (or e.g. functools.negator?) -- equivalent to:
def anti_caller(func):
 def call_and_negate(*args, **kwargs):
 return not func(*args, **kwargs)
 return call_and_negate
What do you think?
*j