A fancy and practical functional tools

Overview

Funcy Build Status Join the chat at https://gitter.im/Suor/funcy

A collection of fancy functional tools focused on practicality.

Inspired by clojure, underscore and my own abstractions. Keep reading to get an overview or read the docs. Or jump directly to cheatsheet.

Works with Python 2.7, 3.4+ and pypy.

Installation

pip install funcy

Overview

Import stuff from funcy to make things happen:

from funcy import whatever, you, need

Merge collections of same type (works for dicts, sets, lists, tuples, iterators and even strings):

merge(coll1, coll2, coll3, ...)
join(colls)
merge_with(sum, dict1, dict2, ...)

Walk through collection, creating its transform (like map but preserves type):

walk(str.upper, {'a', 'b'})            # {'A', 'B'}
walk(reversed, {'a': 1, 'b': 2})       # {1: 'a', 2: 'b'}
walk_keys(double, {'a': 1, 'b': 2})    # {'aa': 1, 'bb': 2}
walk_values(inc, {'a': 1, 'b': 2})     # {'a': 2, 'b': 3}

Select a part of collection:

select(even, {1,2,3,10,20})                  # {2,10,20}
select(r'^a', ('a','b','ab','ba'))           # ('a','ab')
select_keys(callable, {str: '', None: None}) # {str: ''}
compact({2, None, 1, 0})                     # {1,2}

Manipulate sequences:

take(4, iterate(double, 1)) # [1, 2, 4, 8]
first(drop(3, count(10)))   # 13

lremove(even, [1, 2, 3])    # [1, 3]
lconcat([1, 2], [5, 6])     # [1, 2, 5, 6]
lcat(map(range, range(4)))  # [0, 0, 1, 0, 1, 2]
lmapcat(range, range(4))    # same
flatten(nested_structure)   # flat iter
distinct('abacbdd')         # iter('abcd')

lsplit(odd, range(5))       # ([1, 3], [0, 2, 4])
lsplit_at(2, range(5))      # ([0, 1], [2, 3, 4])
group_by(mod3, range(5))    # {0: [0, 3], 1: [1, 4], 2: [2]}

lpartition(2, range(5))     # [[0, 1], [2, 3]]
chunks(2, range(5))         # iter: [0, 1], [2, 3], [4]
pairwise(range(5))          # iter: [0, 1], [1, 2], ...

And functions:

partial(add, 1)             # inc
curry(add)(1)(2)            # 3
compose(inc, double)(10)    # 21
complement(even)            # odd
all_fn(isa(int), even)      # is_even_int

one_third = rpartial(operator.div, 3.0)
has_suffix = rcurry(str.endswith)

Create decorators easily:

@decorator
def log(call):
    print call._func.__name__, call._args
    return call()

Abstract control flow:

walk_values(silent(int), {'a': '1', 'b': 'no'})
# => {'a': 1, 'b': None}

@once
def initialize():
    "..."

with suppress(OSError):
    os.remove('some.file')

@ignore(ErrorRateExceeded)
@limit_error_rate(fails=5, timeout=60)
@retry(tries=2, errors=(HttpError, ServiceDown))
def some_unreliable_action(...):
    "..."

class MyUser(AbstractBaseUser):
    @cached_property
    def public_phones(self):
        return self.phones.filter(public=True)

Ease debugging:

squares = {tap(x, 'x'): tap(x * x, 'x^2') for x in [3, 4]}
# x: 3
# x^2: 9
# ...

@print_exits
def some_func(...):
    "..."

@log_calls(log.info, errors=False)
@log_errors(log.exception)
def some_suspicious_function(...):
    "..."

with print_durations('Creating models'):
    Model.objects.create(...)
    # ...
# 10.2 ms in Creating models

And much more.

Dive in

Funcy is an embodiment of ideas I explain in several essays:

Running tests

To run the tests using your default python:

pip install -r test_requirements.txt
py.test

To fully run tox you need all the supported pythons to be installed. These are 2.6+, 3.3+, PyPy and PyPy3. You can run it for particular environment even in absense of all of the above:

tox -e py27
tox -e py36
tox -e lint
Owner
Alexander Schepanovski
Alexander Schepanovski
Simple RGB to HEX game made in python

Simple RGB to HEX game made in python

5 Aug 26, 2022
a simple function that randomly generates and applies console text colors

ChangeConsoleTextColour a simple function that randomly generates and applies console text colors This repository corresponds to my Python Functions f

Mariya 6 Sep 20, 2022
Numbers-parser - Python module for parsing Apple Numbers .numbers files

numbers-parser numbers-parser is a Python module for parsing Apple Numbers .numbers files. It supports Numbers files generated by Numbers version 10.3

Jon Connell 154 Jan 05, 2023
Retrying is an Apache 2.0 licensed general-purpose retrying library, written in Python, to simplify the task of adding retry behavior to just about anything.

Retrying Retrying is an Apache 2.0 licensed general-purpose retrying library, written in Python, to simplify the task of adding retry behavior to just

Ray Holder 1.9k Dec 29, 2022
glip is a module for retrieve ip address like local-ip, global-ip, external-ip as string.

gle_ip_info glip is a module for retrieve ip address like local-ip, global-ip, external-ip as string.

Fatin Shadab 3 Nov 21, 2021
This two python programs can convert km to miles and miles to km

km-to-miles These two little python programs can convert kilometers to miles and miles to kilometers Needed Python3 or a online python compiler with t

Chandula Janith 3 Jan 30, 2022
✨ Un générateur d'adresse IP aléatoire totalement fait en Python par moi, et en français.

IP Generateur ❗ Un générateur d'adresse IP aléatoire totalement fait en Python par moi, et en français. 🔮 Avec l'utilisation du module "random", j'ai

MrGabin 3 Jun 06, 2021
A Randomizer Oracle

Tezos Randomizer Tezod Randomizer "Oracle". It's a smart contract that you can call to get a random number between X and Y (for now). It uses entropy

Asbjorn Enge 19 Sep 13, 2022
✨ Un bot Twitter totalement fait en Python par moi, et en français.

Twitter Bot ❗ Un bot Twitter totalement fait en Python par moi, et en français. Il faut remplacer auth = tweepy.OAuthHandler(consumer_key, consumer_se

MrGabin 3 Jun 06, 2021
A primitive Python wrapper around the Gromacs tools.

README: GromacsWrapper A primitive Python wrapper around the Gromacs tools. The library is tested with GROMACS 4.6.5, 2018.x, 2019.x, 2020.x, and 2021

Becksteinlab 140 Dec 28, 2022
Utility to add/remove licenses to/from source files

Utility to add/remove licenses to/from source files. Supports processing any combination of globs, files, and directories (recurse). Pruning options allow skipping non-licensing files.

Eduardo Ponce Mojica 2 Jan 29, 2022
A simple dork generator written in python that outputs dorks with the domain extensions you enter

Dork Gen A simple dork generator written in python that outputs dorks with the domain extensions you enter in a ".txt file". Usage The code is pretty

Z3NToX 4 Oct 30, 2022
A morse code encoder and decoder utility.

morsedecode A morse code encoder and decoder utility. Installation Install it via pip: pip install morsedecode Alternatively, you can use pipx to run

Tushar Sadhwani 2 Dec 25, 2021
An URL checking python module

An URL checking python module

Fayas Noushad 6 Aug 10, 2022
Dill_tils is a package that has my commonly used functions inside it for ease of use.

DilllonB07 Utilities Dill_tils is a package that has my commonly used functions inside it for ease of use. Installation Anyone can use this package by

Dillon Barnes 2 Dec 05, 2021
New time-based UUID formats which are suited for use as a database key

uuid6 New time-based UUID formats which are suited for use as a database key. This module extends immutable UUID objects (the UUID class) with the fun

26 Dec 30, 2022
Python implementation of Gorilla time series compression

Gorilla Time Series Compression This is an implementation (with some adaptations) of the compression algorithm described in section 4.1 (Time series c

Ghiles Meddour 19 Jan 01, 2023
Color box that provides various colors‘ rgb decimal code.

colorbox Color box that provides various colors‘ rgb decimal code

1 Dec 07, 2021
Let's renew the puzzle collection. We'll produce a collection of new puzzles out of the lichess game database.

Let's renew the puzzle collection. We'll produce a collection of new puzzles out of the lichess game database.

Thibault Duplessis 96 Jan 03, 2023
Abby's Left Hand Modifiers Dictionary

Abby's Left Hand Modifiers Dictionary Design This dictionary is inspired by and

12 Dec 08, 2022