gamla 63

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גamla is a performant functional programming library for python which supports async.

Installation

pip install gamla

Debugging anonymous compositions

gamla.compose(x, y, z) produces a new function which doesn't have a proper name. If x raises an exception, it is sometimes hard to figure out where this occurred. To overcome this, set the env variable GAMLA_DEBUG_MODE (to anything) to get more useful exceptions. This is turned on only by flag because it incurs significant overhead so things might get slow.

Mixing asynchronous and synchronous code

Most functions in this lib will work seamlessly with async and regular functions, and allow the developer to focus on the logic instead of deciding where to place an await.

For example:

import asyncio

import gamla


def increment(i):
    return i + 1


async def increment_async(i):
    asyncio.sleep(1)
    return i + 1


async def run():
    mixed_composition = gamla.compose_left(increment, increment_async, increment)
    return await mixed_composition(0)  # returns 3!

Migrating from toolz

The main problems - toolz is slow and does not support async functions.

Why are curried functions and composition in toolz slow?

These functions use an expensive inspect call to look at a function’s arguments, and doing so at each run.

Why does gamla not suffer from this problem?

Two reasons:

1. It does not have binary signatures on things like map, so it doesn’t need to infer anything (these are higher order functions in gamla).
2. The gamla.curry function eagerly pays for the signature inspection in advance, and remembers its results for future runs.

Function mapping and common gotchas:

Most functions are drop in replacements. Here are some examples:

• curried.(filter|map|valmap|itemmap|keymap) -> gamla.$1 (make sure the call is with a single argument)
• toolz.identity -> gamla.identity
• toolz.contains -> gamla.contains
• toolz.lt -> gamla.greater_than
• toolz.gt -> gamla.less_than
• toolz.ge -> gamla.less_equals
• toolz.le -> gamla.greater_equals
• toolz.filter(None) -> gamla.filter(gamla.identity)
• toolz.excepts(a, b, c) -> gamla.excepts(a, c, b)
• toolz.excepts(a, b) -> gamla.excepts(a, gamla.just(None), b) (following the “data-last” currying convention)

Releasing a new version

1. Create a pypi account.
2. Download twine and give it your pypi credentials.
3. Get pypi permissions for the project from its owner.
4. python setup.py sdist bdist_wheel; twine upload dist/*; rm -rf dist;

How to update gamla documentation after library update

If a new function was added

1. Go to docs/api.rst and add your function name under the relevant module, with an indentation of 3 spaces. For example:

.. currentmodule:: gamla.functional_generic

.. autosummary::
   old_functions
   .
   .
   .
   my_new_function

If README.md was updated

While in gamla directory:

1. Install md-to-rst converter: pip install m2r
2. Convert README.md to README.rst: m2r README.md
3. Move README.rst to docs/source folder instead of existing one: mv README.rst docs/source

If an existing function was updated

Do nothing. The documentation will update itself.