28 lines
556 B
Python
28 lines
556 B
Python
|
"""An error-handling model influenced by that used by the Rust programming language
|
||
|
|
|
||
|
|
See https://doc.rust-lang.org/book/ch09-00-error-handling.html.
|
||
|
|
"""
|
||
|
|
from typing import Generic, TypeVar, Union
|
||
|
|
|
||
|
|
T = TypeVar("T")
|
||
|
|
E = TypeVar("E", bound=Exception)
|
||
|
|
|
||
|
|
|
||
|
|
class Ok(Generic[T]):
|
||
|
|
def __init__(self, value: T) -> None:
|
||
|
|
self._value = value
|
||
|
|
|
||
|
|
def ok(self) -> T:
|
||
|
|
return self._value
|
||
|
|
|
||
|
|
|
||
|
|
class Err(Generic[E]):
|
||
|
|
def __init__(self, e: E) -> None:
|
||
|
|
self._e = e
|
||
|
|
|
||
|
|
def err(self) -> E:
|
||
|
|
return self._e
|
||
|
|
|
||
|
|
|
||
|
|
Result = Union[Ok[T], Err[E]]
|