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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.


pip install polypie


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


from typing import Any, Sequence

from polypie import polymorphic, PolypieException

def example(a: int, b):

def example(a: str, b: Any):

def example(a: Sequence[str]):

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

class Example:

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

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

    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


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

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