pyella 1.1.0

This library brings common monads such `Maybe` and `Either` to your Python projects.

Pyella

This library brings common monads such as Maybe and Either to your Python projects.

Requirements

• Python 3.7+

Installation

pip3 install pyella

Usage

Maybe

The snippet below demonstrates some of the oprations that are available for Maybe.

from pyella.maybe import Maybe

j0 = Maybe.of(1)
print (j0)
# Output: Just(1)

print (j0.from_maybe(-1))
# Output: 1

j1 = j0.fmap(lambda x:x*2)
print(j0)
print(j1)
# Output:
#
# Just(1)
# Just(2)

Either

And these are some things you can do with Either.

from pyella.either import Either, left, lefts, right, rights

e0: Either[str, int] = left("invalid value")
print(e0)
# Output: Left(invalid value)

print (e0.if_left(-1))
print (e0.if_right("the value was valid"))
# Output:
#
# -1
# 'invalid value'

e1: Either[str, int] = right(1)
print (e1)
# Output: Right(1)

e2 = e1.fmap(lambda x:x*2)
print(e1)
print(e2)
# Output:
#
# Right(1)
# Right(2)

valid_values = rights([e0, e1, e2])
print (valid_values)
# Output: [1, 2]

Contributing

See the contributing guide to learn how to contribute to the repository and the development workflow.

Code of Conduct

Contributor Code of Conduct. By participating in this project you agree to abide by its terms.

License

MPL-2.0