This is a library to do functional programming in Python.

Related tags

Miscellaneousfpy_lib
Overview

Fpylib

This is a library to do functional programming in Python.

Index

Features

Intelligents Ranges with irange

This library provides a function irange that behaves like range but is capable to understand the range that is needed with first, second and the final values. It is receive a Number or a String and return a generator.

To use it, you can use the following syntax:

# Range finite with step 1
list(irange(1, ..., 10))  # Output: [1, 2, 3, 4, 5, 6, 7, 8, 9]
list(irange(1.1, ..., 5.2))  # Output: [1.1, 2.1, 3.1, 4.1, 5.1]
list(irange("a", ..., "l"))  # Output: ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l']
list(irange("A", ..., "M", final_include=True))  # Output: ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M']

# Range finite with step custom
list(irange(0, 2, 12))  # Output: [0, 2, 4, 6, 8, 10]
list(irange(0.1, 0.5, 2.5))  # Output: [0.1, 0.5, 0.9, 1.3, 1.7000000000000002, 2.1]
list(irange("a", "c", "l"))  # Output: ['a', 'c', 'e', 'g', 'i', 'k']

# Range infinite with step custom
list(irange(0, 5))  # Output: [0, 1, 2, 3, 4, 5 ...] An infinite range.
list(irange(0.1, 0.6))  # Output: [0.1, 0.7, 1.2999999999999998 ...] An infinite range.
list(irange("a"))  # Output: ['a', 'b', ..., 'z', 'aa', 'ab', ...] An infinite range.

Lazyness to functions

Inspired by Haskell, this library provides a function lazy_eval that can be used to make a function lazy. This function is a decorator that can be used to make a function lazy, and lazy_class also a decorator to classes that can be used to make all methods lazy.

For example, the following code:

@lazy_eval
def sum3(x, y, z):
    return x + y + z

sum3(1)       # Output: A functions that receive 2 arguments.
sum3(1, 2)    # Output: A functions that receive one arguments.
sum3(1, 2, 3) # Output: 6

And to make the class Foo lazy, the following code:

@lazy_class
class Foo:
  def __init__(self, x):
    self.x = x

  def sum3(self, y, z):
    return self.x + y + z

foo = Foo(1)
sum_five = foo.sum3(2, 3) # Output: A functions that receive one arguments.
sum_five(4)               # Output: 9

This is a very useful feature to make a function lazy, and do not use the function partial to do not evaluate directly the function.

Compose and paralelize functions

Into this library, there is a function compose that can be used to compose two or more functions, to make pipelines to process data. Also, there is a function parallelize that can be used to paralelize a function.

For example, the following code:

decendent_pair_numbers = compose(
  lambda x: list(range(x)),
  lambda x: x[::-1],
  lambda x: x[::2]
)

decendent_pair_numbers(5) # Output: [4, 2, 0]

And the following code:

def median(*xs):
    if len(xs) % 2 == 0:
        return (xs[len(xs) // 2 - 1] + xs[len(xs) // 2]) / 2
    return xs[len(xs) // 2 + 1]


describe = parallelize(
    lambda *xs: sum(xs) / len(xs),
    median,
    max,
    min,
)

describe(1, 2, 3, 4, 5, 6) # Output: (3.5, 3.5, 6, 1)

In this case, the functions into parallelize receive the same arguments, but it can receive a agument different to each function with the parameter uniqui_intput. For example:

func_parallelized = parallelize(
    sorted,
    sum,
    max,
    min,
)

list_1 = [1, 4, 2, 3, 4, 1, 2, 3, 4, 10]
list_2 = [5, 6, 7, 8, 9, 10]
list_3 = [-1, -5, 100, 19, 99]

func_parallelized(
  list_1, list_2, list_3, list_3, uniqui_intput=False
) # Output: ([1, 1, 2, 2, 3, 3, 4, 4, 4, 10], 45, 100, -5)
Owner
Fabián Vega Alcota
I'm a student of computer engineering, and with a passion for learning new things like Data Science, AI, and Computer Science.
Fabián Vega Alcota
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