btypes

Aliases with correct capitalization for built-in Python types.

PEP8 states that classes should have names in CamelCase. However, all the built-in types are lower case: str, bool, int, float, list, dict, etc. This library provides aliases for all these types that are capitalized correctly. They are straightforward aliases and can be used exactly like the original types.

Install

Requires Python 3.9+.

pip install btypes

Examples

from btypes import Int, List, Str

def comma_list(lst: List[Int]) -> Str:
    return ", ".join(Str(e) for e in lst)

def range_list(limit: Int) -> List[Int]:
    return List(range(limit))

Also works with pattern matching:

from btypes import Bool, Str, Union

def print_type(x: Union[Bool, Str]) -> None:
    match x:
        case Bool():
            print("a boolean")
        case Str():
            print("a string")

FAQs

Why require Python 3.9 as the minimum version?

Because Python 3.9 introduced generic collections in the standard library: list[int], dict[str, float]; and the whole point of btypes is that you can use the same identifier as constructor and as type annotation.