Python Signature Lens

Display Haskell-style type signatures above Python functions using CodeLens.

Features

• Curried function signatures displayed above Python function definitions
• Supports generic type parameters and bounded constraints
• Handles class methods with inherited type parameters
• Works with async functions and multi-line signatures

Examples

The comments are shown above the function definitions using CodeLens.

# add :: int -> int -> int
def add(x: int, y: int) -> int:
    return x + y

# find :: (T: Comparable) => [T] -> T -> int?
def find[T: Comparable](https://github.com/ubreblanca/vscode-py-sig-lens/blob/HEAD/items: list[T], target: T) -> Optional[int]:
    ...

# process :: {str: [int]} -> (int, str)
def process(data: dict[str, list[int]]) -> tuple[int, str]:
    ...

# apply :: [int] -> (int -> str) -> [str]
def apply(items: list[int], fn: Callable[[int], str]) -> list[str]:
    ...

Type Transformations

Configuration