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Python polymorphic function declaration with obvious syntax

Project description

Build Status Coverage Status PyPI version PyPI license

Python polymorphic function declaration with obvious syntax. Just use the same function name and mark each function definition with @polymorphic decorator.

Installation

pip install polypie

Requirements

  • Python 3.5+
  • typeguard (will be installed automatically)

Example

from typing import Any, Sequence

from polypie import polymorphic, PolypieException


@polymorphic
def example(a: int, b):
    print('(1)')


@polymorphic
def example(a: str, b: Any):
    print('(2)')


@polymorphic
def example(a: Sequence[str]):
    print('(3)')


example(100, 200)   # (1)
example('foo', 200)   # (2)
example(['foo'])   # (3)
example(('bar', 'baz'))   # (3)
try:
    example({'foo': 'bar'})
except PolypieException as exc:
    print(exc)   # Matching signature <...> not found


class Example:

    def __init__(self):
        self.values = {}

    @polymorphic
    def value(self, name):
        return self.values[name]

    @polymorphic
    def value(self, name, value):
        self.values[name] = value


instance = Example()
instance.value('foo', 100)
instance.value('bar', 'baz')
print(instance.value('foo'))   # 100
print(instance.value('bar'))   # baz

Tests

tox [-e ENV] [-- --cov]

Project details


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