Python Dev Notes
TypeVar Contravariance
TypeVar contravariance for type-safe class hierarchies and proper subtyping
Lazy Logging
Optimize Python logging performance with lazy evaluation techniques
Interface Stubs
Resolve circular imports using Abstract Base Classes for cleaner module dependencies
__slots__
__slots__ for compact and faster object storage
TypedDict
TypedDict for type-safe dictionaries with optional keys
__bool__
__bool__ dunder method for truthiness evaluation
TypeGuard
TypeGuard for type narrowing and better type safety
__all__
Control module exports explicitly with Python's __all__
Enum Magic
Enum, StrEnum, IntEnum, and Flags for type-safe constants
ABC (Abstract Base Classes)
Enforce method implementation at instantiation time with Python's ABC
__post_init__
Validate dataclass fields at instantiation time using __post_init__ for better encapsulation
TYPE_CHECKING
Import types conditionally to avoid circular imports and heavy dependencies
NotImplemented
Use NotImplemented constant for binary operations and method delegation
Self
Self type hint for better type safety
functools.partial
functools.partial for elegant function composition and cleaner code
@override Decorator
@override decorator prevents inheritance bugs and makes your code more maintainable
Patch Stack
ExitStack-powered teardown for reliable tests