Simple mixin class in Python extracted from my framework Pyttman, mitigating the need to override __repr__ in convoluted ways over and over.

mixins.py

class PrettyReprMixin:
    """
    Mixin providing a common interface for
    __repr__ methods which represents classes
    in a very readable way.
    
    - How to use:
    Define which fields to include when printing the
    class or calling repr(some_object), by adding their
    names to the '__repr_fields__' tuple.

    class User(PrettyReprMixin):
        __repr_fields__ = ("first_name", "last_name", "property_attrib")

        def __init__(self, first_name, last_name)
            self.first_name = first_name
            self.last_name = last_name

        @property
        def property_attrib(self) -> str:
            return "Something dynamic, just add my name in __repr_fields__"

    This is just too handy!
    """
    __repr_fields__ = ()

    def __repr__(self):
        name = self.__class__.__name__
        attrs = [f"{i}={getattr(self, str(i))}" for i in self.__repr_fields__]
        return f"{name}({', '.join(attrs)})"