Pyhandling 2.1.2

Library for advanced continuous handling of anything

Pyhandling

Library for advanced continuous handling of anything

Provides tools to extend single call logic on a nearly unlimited scale
You can even integrate the entire program logic into one call

Installation

pip install pyhandling

Usage examples

Composition

Merge your functions into one

from pyhandling import *


complemented_number = str |then>> (lambda line: line + '6') |then>> int
complemented_number(25)

to later get

256

or you can do the same but call the function immediately

25 >= str |then>> (lambda line: line + '6') |then>> int

and get the same result

256

Currying

Add additional arguments to function input arguments

formattly_sum = "{} {}{}".format

post_partial(formattly_sum, "world", '!')("Hello") 

not necessarily now

container = close(formattly_sum)
opened_container = container("Hello")

opened_container("world", '!')

using all possible ways

post_container = close(formattly_sum, closer=post_partial)

post_container('!')("Hello", "world")

Eventually, they all return

Hello world!

Interface control

Abstract the output value

print(returnly(print)("Some input argument"))

Some input argument
Some input argument

or input values

from functools import partial


eventually(partial(print, 42))(2, 4, 8, 16, 32)

42

Atomic functions

Use any python atomic operations as functions

(lambda reource: (raise_ if isinstance(reource, Exception) else return_)(reource))("no error") # "no error"

execute_operation(60, '+', 4) # 64

transform_by('not', str()) # True

call(range, 16) # range(16)

getitem_of({"some-key": "some-value"}, "some-key") # "some-value"

take(42) # lambda *_, **__: 42

Annotating

Use standart annotation templates from annotations package for routine cases

from pyhandling.annotations import checker_of, reformer_of, merger_of

from pyannotating import number


is_number_even: checker_of[number] = lambda number: number % 2 == 0

add_hundert_to: reformer_of[number] = lambda number: number + 100

format_lines: merger_of[str] = "{first} {second}{end_symbol}".format

or annotations themselves

from pyannotating import many_or_one

from pyhandling.annotations import handler, decorator


executing_of: Callable[[many_or_one[handler]], decorator] = ...

Function building

Create functions by describing them

total_sum: Callable[[Iterable[many_or_one[number]]], number] = documenting_by(
    """
    Function of summing numbers from the input collection or the sum of its
    subcollection.
    """
)(
    close(map |then>> tuple)(
        on_condition(post_partial(isinstance, Iterable), sum, else_=return_)
    )
    |then>> sum
)

in several processing processes

ratio_of_square_to_full: reformer_of[number] = documenting_by(
    """
    Function of getting the ratio of the square of the input number to the
    input number to the power of its value.
    """
)(
    mergely(
        take(execute_operation),
        mergely(
            take(execute_operation),
            return_,
            take('*'),
            return_
        ),
        take('/'),
        mergely(
            take(execute_operation),
            return_,
            take('**'),
            return_
        )
    )
)

or in an indefinite number of iterative executions

from pyhandling.annotations import dirty


increase_up_to_ten: dirty[reformer_of[number]] = documenting_by(
    """
    Function that prints numbers between the input number and 10 inclusive and
    returns 10.
    """
)(
    recursively(
        returnly(print) |then>> post_partial(execute_operation, '+', 1),
        post_partial(execute_operation, '<', 10)
    )
    |then>> returnly(print)
)


increase_up_to_ten(8)

8
9
10

Chain breaking

Forcibly break the chain of actions

optionally_exponentiate: Callable[[number], number | BadResourceWrapper] = documenting_by(
    """Function of exponentiation of the input number if it is > 0."""
)(
    maybe(
        on_condition(
            post_partial(execute_operation, '<', 0),
            BadResourceWrapper,
            else_=return_
        )
        |then>> post_partial(execute_operation, '**', 2)
    )
)


-16 >= optionally_exponentiate |then>> print

<Wrapper of bad -16>

with the possibility of returning a "bad" resource

main: dirty[reformer_of[number]] = optionally_exponentiate |then>> optionally_get_bad_resource_from

8 >= optionally_exponentiate |then>> print
-16 >= optionally_exponentiate |then>> print

64
-16

You can also interrupt by returning an error proxy that stores the error
that occurred while processing this resource and the resource itself

from pyhandling.annotations import reformer_of


div_by_zero: reformer_of[number] = documenting_by(
    """Function for dividing an input number by zero."""
)(
    post_partial(execute_operation, '/', 0)
)


main: Callable[[number], number | BadResourceError] = (
    returnly_rollbackable(div_by_zero, take(True))
)


256 >= main |then>> print

BadResourceError('Resource "256" could not be handled due to ZeroDivisionError: division by zero')

with corresponding possibilities

main: reformer_of[number] = (
    partial(map |then>> maybe, post_partial(returnly_rollbackable, take(True)))(
        post_partial(execute_operation, '*', 2)
        |then>> div_by_zero
    )
    |then>> optionally_get_bad_resource_from
)


16 >= main |then>> print

32

Debugging

Display intermediate results

showly(total_sum)([128, [100, 28]])

[128, [100, 28]]
(128, 128)
256

by different ways

logger = Logger(is_date_logging=True)

showly(total_sum, writer=logger)([[2, 10], [15, 15]])

print(*logger.logs, sep='\n')

[2023-01-24 21:38:28.791516] [[2, 10], [15, 15]]
[2023-01-24 21:38:28.791516] (12, 30)
[2023-01-24 21:38:28.791516] 42