Python wrapper for api use in the cave_app
Project description
Pamda
Python wrapper for functional programming in object oriented structures.
Inspired heavily by Ramda.
Documentation for Pamda Functions
https://connor-makowski.github.io/pamda/pamda/pamda.html
Key Features
- Simplified functional programming for python
- Core Functions include:
curry
arbitrary methods and functionsthunkify
arbitrary methods and functionspipe
data iteratively through n functions
- List based path access and features for nested dictionaries
Setup
Make sure you have Python 3.9.x (or higher) installed on your system. You can download it here.
Installation
pip install pamda
Getting Started
Basic Usage
from pamda import pamda
data={'a':{'b':1, 'c':2}}
# Example: Select data given a path and a dictionary
pamda.path(['a','b'])(data) #=> 1
# See documentation for all core pamda functions at
# https://connor-makowski.github.io/pamda/pamda.html
Curry Usage
from pamda import pamda
# Define a function that you want to curry
def myFunction(a,b,c):
return [a,b,c]
# You can call pamda.curry as a function to curry your functions
curriedMyFn=pamda.curry(myFunction)
# Inputs can now be passed in an async fashion
# The function is evaluated when all inputs are added
x=curriedMyFn(1,2)
x(3) #=> [1,2,3]
x(4) #=> [1,2,4]
# Each set of inputs returns a callable function
# You can stack inputs on a single line for clean functional programming
curriedMyFn(1,2)(3) #=> [1,2,3]
For enforcing types, pamda relies on type_enforced but curried objects do not play nice with type_enforced
objects. To fix this, there is a special curry function, curryType
, that enables type_enforced annotations for your curried functions:
>>> from pamda import pamda
>>>
>>> # Pamda CurryTyped
>>> @pamda.curryTyped
... def add(a:int,b:int):
... return a+b
...
>>> add(1)(1)
2
>>> add(1)(1.5)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/home/conmak/development/personal/pamda/pamda/pamda_curry.py", line 43, in __call__
results = self.__fnExecute__(*new_args, **new_kwargs)
File "/home/conmak/development/personal/pamda/venv/lib/python3.10/site-packages/type_enforced/enforcer.py", line 90, in __call__
self.__check_type__(assigned_vars.get(key), value, key)
File "/home/conmak/development/personal/pamda/venv/lib/python3.10/site-packages/type_enforced/enforcer.py", line 112, in __check_type__
self.__exception__(
File "/home/conmak/development/personal/pamda/venv/lib/python3.10/site-packages/type_enforced/enforcer.py", line 34, in __exception__
raise TypeError(f"({self.__fn__.__qualname__}): {message}")
TypeError: (add): Type mismatch for typed variable `b`. Expected one of the following `[<class 'int'>]` but got `<class 'float'>` instead.
Thunkify Usage
from pamda import pamda
# Define a function that you want to thunkify
# thunkify can be called as a function or decorator
@pamda.thunkify
def myFunction(a,b,c):
return [a,b,c]
# The function is now curried and the evaluation is lazy
# This means the function is not evaluated until called
x=myFunction(1,2)
x(3) #=> <pamda.curry_obj object at 0x7fd514e4c820>
x(3)() #=> [1,2,3]
y=x(4)
y() #=> [1,2,4]
Thunkified functions can be executed asynchronously.
from pamda import pamda
import time
@pamda.thunkify
def test(name, wait):
print(f'{name} start')
time.sleep(wait)
print(f'{name} end')
return wait
async_test_a = pamda.asyncRun(test('a',2))
async_test_b = pamda.asyncRun(test('b',1))
async_test_a.asyncWait()
async_test_c = pamda.asyncRun(test('c',1))
The above code would output:
a start
b start
b end
a end
c start
c end
Pipe
from pamda import pamda
def square(x):
return x**2
def half(x):
return x/2
def negate(x):
return -x
# You can pipe data through multiple functions for clean functional programming
pamda.pipe([square, half, negate])(args=(6,),kwargs={}) #=> -18
Use pamda as a subclass
from pamda import pamda
class myClass(pamda):
def myFunction(self, a):
return self.inc(a)
mc=myClass()
mc.myFunction(2) #=> 3
@mc.curry
def addUp(a,b):
return a+b
addUp(1)(2) #=> 3
Pamda Utils
- Pamda also ships with a few helpful utilities
- Check out the documentation here:
Project details
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