https://github.com/pj/hacky_python_typeclasses

Typeclasses for Python (badly)
https://github.com/pj/hacky_python_typeclasses

Last synced: 8 months ago
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Typeclasses for Python (badly)

• Host: GitHub
• URL: https://github.com/pj/hacky_python_typeclasses
• Owner: pj
• Created: 2015-05-27T22:54:03.000Z (about 11 years ago)
• Default Branch: master
• Last Pushed: 2015-05-27T22:54:13.000Z (about 11 years ago)
• Last Synced: 2025-02-16T19:14:49.486Z (over 1 year ago)
• Language: Python
• Size: 102 KB
• Stars: 0
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

          
# Hacky typeclasses for Python

Basically the idea is to use python decorators to fake Haskell typeclasses (badly).

To create a method for a typeclass:

```python

from typeclass import typemethod

class Show(object):

    pass

@typemethod(Show)

def show(val):

    # If there is no default then just raise NotImplementedError()

    return str(val)

```

To create an instance:

```python

from typeclass import typeinstance

import show

class Something(object):

    def __init__(self, a):

        self.a = a

@typeinstance(Something, show.show)

def show(val):

    return "Something: " + str(val.a)

```

Then use it by importing the show method from the typeclass and ensuring that

the instance is loaded:

```python

from show import show

from something import Something

print show(Something(42))

```