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22nd August 2021

Computer Science⚑

Programming⚑

Basics⚑

  • New: String remove prefix suffix methods.

    • str.removeprefix(prefix): If the string starts with the prefix string, return str[len(prefix):]. Otherwise, return a copy of the original string.
    • str.removesuffix(suffix): If the string ends with the suffix string and that suffix is not empty, return str[:-len(suffix)]. Otherwise, return a copy of the original string.

  • New: Current local date and time.

  • New: TypedDict.

    Special construct to add type hints to a dictionary. At runtime it is a plain dict.

    Example:

    class Point2D(TypedDict):
    x: int
    y: int
    label: str

a: Point2D = {'x': 1, 'y': 2, 'label': 'good'}  # OK
b: Point2D = {'z': 3, 'label': 'bad'}           # Fails type check

mypy⚑

  • New: Ignore line for type checking.

    To ignore type checking in one particular line of the code, add the comment # type: ignore at the end of that line

pydantic⚑

  • New: Root_validator.

    Validation can also be performed on the entire model's data.

Snippets⚑

  • New: Find in dictionary.

    Find first element in dictionary that satisfies a condition:

    next(item for item in {dict} if {{ condition }})

Other⚑

  • New: Order of abstractmethod classmethod.

    Use @abstractmethod before classmethod. See Issue 16267.