Algebraic Data Types in Python
import adt
class MyADT(adt.ADT):
foo: ()
bar: (int,)
baz: (int, bool, str, None)
@adt.fieldmethod
def double_first(field, basecls) -> "MyADT":
if isinstance(field, basecls.foo):
raise TypeError(
f"{basecls.foo.__qualname__} does not support doubling"
)
field_type = type(field)
first, *rem = field
return field_type(first * 2, *rem)
foo = MyADT.foo()
bar = MyADT.bar(4)
baz = MyADT.baz(3, False, "hi", None)
for val in [foo, bar, baz]:
print(val)
try:
doubled = val.double_first()
print("Doubled:", doubled)
except TypeError:
print("Failed to double")
print()
See examples/, adt/example.py and tests/test.py.
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