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from collections.abc import Iterable
from typing import TypeVar
from returns.interfaces.unwrappable import Unwrappable
from returns.primitives.exceptions import UnwrapFailedError
_ValueType_co = TypeVar('_ValueType_co', covariant=True)
_ErrorType_co = TypeVar('_ErrorType_co', covariant=True)
def partition(
containers: Iterable[Unwrappable[_ValueType_co, _ErrorType_co],],
) -> tuple[list[_ValueType_co], list[_ErrorType_co]]:
"""
Partition a list of unwrappables into successful and failed values.
Preserves order.
.. code:: python
>>> from returns.result import Failure, Success
>>> from returns.methods import partition
>>> results = [Success(1), Failure(2), Success(3), Failure(4)]
>>> partition(results)
([1, 3], [2, 4])
"""
successes: list[_ValueType_co] = []
failures: list[_ErrorType_co] = []
for container in containers:
try:
successes.append(container.unwrap())
except UnwrapFailedError: # noqa: PERF203
failures.append(container.failure())
return successes, failures
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