Skip to main content
Help us improve Python packaging – donate today!

Functional Pattern Matching for Python

Project Description

Splarnektity provides a limited, but valuable, form of functional pattern matching to Python, a la OCaml, Erlang, Haskell, et al.. Another way of thinking of this is: pattern matching over Python lists.

Here is a quick example of Splarnektity’s usage:

from splarnektity import FMatch

sexpr = ('person',
            ('name', 'john'),
            ('address', ('line1', '123 Townville'), ('zip', 54321)),
            ('age', 24),
            ('favorite foods', 'pizza', 'dorritos'),

for x in sexpr[1:]:
    f = FMatch(x)
    V1, V2 = f.var(2)
    if f.when(('name', V1)):
        print 'name:          ', V1.v
    elif f.when(('address', ('line1', V1), ('zip', V2))) and
        print 'address line1: ', V1.v
        print 'address zip:   ', V2.v
    elif f.when(('age', V1)) and
        print 'age:           ', V1.v
    elif f.when(('favorite foods', V1.others)): # variable length matching
        print 'favorite foods:', V1.v

The result of this example is:

name:           john
address line1:  123 Townville
address zip:    54321
age:            24
favorite foods: ('pizza', 'dorritos')

Release history Release notifications

This version
History Node


History Node


History Node


Supported by

Elastic Elastic Search Pingdom Pingdom Monitoring Google Google BigQuery Sentry Sentry Error logging CloudAMQP CloudAMQP RabbitMQ AWS AWS Cloud computing Fastly Fastly CDN DigiCert DigiCert EV certificate StatusPage StatusPage Status page