The Maybe Pipe

maybe is just like pipe, except if any of the piped functions returns None the execution is stopped and None is returned immediately.

Example:

>>> from pipetools import maybe, X
>>> f = maybe | (re.match, r'^number-(\d+)$') | X.group(1) | int
>>> f('number-7')
7
>>> f('something else')
None

Can be used together with unless() to great effect:

content = 'file.txt' > maybe | unless(IOError, open) | X.read()