semvec/pypi-packages huggingface dataset:
Coalesce 0.3
simple Python library with coalesce function and "magic" empty value

coalesce
========

Simple Python library with coalesce function and "magic" empty value and
others features

Installation
------------

::

    pip install coalesce

Features
--------

UniqueValue
~~~~~~~~~~~

This is a factory of some abstract unique values

Example:

.. code:: python

    from coalesce import UniqueValue

    Yes = UniqueValue(truthful=True)
    MayBe = UniqueValue()
    IDontKnow = UniqueValue()
    Unlikely = UniqueValue()
    No = UniqueValue(truthful=False)


    def answer_lottery():
        import random
        return random.choice((Yes, MayBe, IDontKnow, Unlikely, No))


    print("- Are you hungry?")
    hungry_answer = answer_lottery()
    try:
        if hungry_answer:
            print("- YES, i would eat an elephant!")
        else:
            print("- I'm fed up...")
    except TypeError:
        print("- Well, I want only coffee")


    print("- Will you marry me?")
    marry_answer = answer_lottery()
    if marry_answer == Yes:
        print("- Well, finally, YES!")
    elif marry_answer == MayBe:
        print("- Well, only if you really are rich...")
    elif marry_answer == IDontKnow:
        print("- I need to think...")
    elif marry_answer == Unlikely:
        print("- When the cancer on the mountain whistles.")
    elif marry_answer == No:
        print("- Who are you, boy?")

empty
~~~~~

The ``empty`` is conrete falsely UniqueValue.

Using in situations, when we want differ None and real "empty" value.
For example set a dynamically calculated default value:

.. code:: python

    from coalesce import empty
    from random import randint


    def f(value=empty):
        if value == empty:
            value = randint(1,10)
        print('value={}'.format(value))

    f()  # value=<random(1,10)>
    f(None)  # value=None

coalesce
~~~~~~~~

Function returns first not ignoring value from iterable object. By
default ignoring ``empty`` value

Example:

.. code:: python

    from coalesce import coalesce, empty
    from random import randint


    def f(value=empty):
        value = coalesce([value, randint(1,10)])
        print('value={}'.format(value))

    f()  # value=<random(1,10)>
    f(None)  # value=None

    print coalesce([None, 1, 2], ignore=None, default=-7)  # 1
    print coalesce([None, None], ignore=None, default=-7)  # -7

first
~~~~~

Function returns first value from iterable for which the
``function(value)`` is truthful from iterable object. Else it returns
default value

Example:

.. code:: python

    from coalesce import first

    print first(lambda x: x > 1, [None, 1, 2], default=-7)  # 2
    print first(lambda x: x > 2, [None, 1, 2], default=-7)  # -7