Moshmosh

The TRUE implementation of pattern matching for Python.

For more than pattern matching, check syntax_rule.py.

@syntax_rule(pattern_matching)
def f(x, r=1):
    with match(x):
        if case[0]: return 1
        if case[x]: return f(x-1, r * x)

return f(10)

Features

• Tree pattern matching: if C1(C2(1), ""): ...

• Unlike projects using inspect.getsource, syntax extensions are achieved without evil IO operations or requiring source files.

• Literal patterns:

  • string, number and other constant patterns
  • tuple, list patterns

• Provided with the capabilities to customize semantics of python syntaxes.

Benchmarks

Check benchmark.py.

Although Pampy is much weaker than moshmosh, it's also much slower than moshmosh :) . Note tha moshmosh is currently a simple prototype implemented in few hours.

Thus we can safely conclude, A true one is always better than the fakers.

Acknowledgements

See older implementations and search "pattern matching" in Python-ideas.

Salute all the people used to work for Python pattern matching.