On Wed, Mar 16, 2016 at 4:57 PM, Steven D'Aprano <st...@pearwood.info> wrote:
> There's a powerful technique used in shell-scripting languages like bash: > pipes. The output of one function is piped in to become the input to the > next function. > > According to Martin Fowler, this was also used extensively in Smalltalk: > > http://martinfowler.com/articles/collection-pipeline/ > > and can also be done in Ruby, using method chaining. > > Here is a way to do functional-programming-like pipelines to collect and > transform values from an iterable: > > https://code.activestate.com/recipes/580625-collection-pipeline-in-python/ > > For instance, we can take a string, extract all the digits, convert them to > ints, and finally multiply the digits to give a final result: > > py> from operator import mul > py> "abcd12345xyz" | Filter(str.isdigit) | Map(int) | Reduce(mul) > 120 > > <..snip..> > Would be nice if this was possible: >>> get_digits = Filter(str.isdigit) | Map(int) >>> 'kjkjsdf399834' | get_digits Also, how about using '>>' instead of '|' for "Forward chaining" Regards, Omar -- https://mail.python.org/mailman/listinfo/python-list
