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Pattern matching for python

Project description

Pattern matching for python.

Installation

pip install patterns

Usage

from patterns import patterns, Mismatch

@patterns
def factorial():
    if 0: 1
    if n is int: n * factorial(n-1)
    if []: []
    if [x] + xs: [factorial(x)] + factorial(xs)
    if {'n': n, 'f': f}: f(factorial(n))

assert factorial(0) == 1
assert factorial(5) == 120
assert factorial([3,4,2]) == [6, 24, 2]
assert factorial({'n': [5, 1], 'f': sum}) == 121

factorial('hello') # raises Mismatch

See tests for more examples.

TODO

  • docs

  • better handling of None, True, False matching

  • matching to _ should not capture

  • name parameter

  • better handling of Mismatch passing to function env

  • non-strict dict matching

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