Python polymorphic function declaration with obvious syntax
Project description
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')) # bazTests
tox [-e ENV] [-- --cov]
