python-rm
Provides the Result and Maybe monads for effective functional programming.
Installation
With uv (recommended):
uv add python-rm
With pip:
pip install python-rm
Examples
Result
import rm
def divide(a: float, b: float) -> rm.Result[float, str]:
if b == 0:
return rm.Err("cannot divide by zero")
return rm.Ok(a / b)
ok_value = (
divide(8, 2)
.map(lambda v: v**2)
.unwrap_or(5)
)
print(value) #> 16
err_value = divide(10, 0).unwrap_or(5)
print(value) #> 5
Maybe
import rm
users: dict[int, str] = {
0: "Luke",
1: "Leia",
2: "Han"
}
def get_user(id: int) -> rm.Maybe[str]:
user = users.get(id)
if user is None:
return rm.Nothing
return rm.Some(user)
some_value = (
get_user(0)
.map(lambda v: v.upper())
.unwrap_or("VADER")
)
print(some_value) #> LUKE
nothing_value = (
get_user(10)
.map(lambda v: v.lower())
.unwrap_or("vader")
)
print(nothing_value) #> vader
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