Description:
predica 0.1.1
predica
Predicates for use in higher-order functions.
Installation
pip install predica
Usage
Let's illustrate usage with three examples, gradually improving the composability of the code:
Simple example -
from predica import P # you can import `Predicates` too
ages = [1, 10, 100, 1000, '1']
# before
ages_no_str = list(filter(lambda x: not isinstance(x, str), ages)) # [1, 10, 100, 1000]
# after
new_ages_no_str = list(filter(P.not_instanceof(str), ages)) # [1, 10, 100, 1000]
Suppose you have a pre-existing function is_str -
def is_str(x: str) -> bool:
return isinstance(x, str)
# before
ages_no_str = list(filter(lambda x: not is_str(x), ages)) # [1, 10, 100, 1000]
# after
new_ages_no_str = list(filter(P.negation(is_str), ages)) # [1, 10, 100, 1000]
IMO this works best with returns library
(and is why I made this library to begin with) -
from returns.result import Result
from functools import partial
ages = Result.from_value([1, 10, 100, 1000, '1'])
ages.map(partial(filter, P.not_instanceof(str))).map(list) # Success([1, 10, 100, 1000])
# or
ages.map(partial(filter, P.negation(is_str))).map(list) # Success([1, 10, 100, 1000])
Much better 😮
License
For personal and professional use. You cannot resell or redistribute these repositories in their original state.
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