Metaclass to apply staticmethod decorator to all the methods of a class

staticmeta.py

from types import FunctionType


class StaticMeta(type):
    def __new__(cls, name, bases, attrs):
        """Metaclass to apply staticmethod decorator to all the methods."""

        new_cls = super().__new__(cls, name, bases, attrs)
        # key is attribute name and val is attribute value in the attrs dict
        for key, val in attrs.items():
            if isinstance(val, FunctionType) and not key.startswith("__"):
                setattr(new_cls, key, staticmethod(val))
        return new_cls


class Foo(metaclass=StaticMeta):
    def __init__(self):
        pass

    def bar():
        return "Look Ma! No self in this method"


foo = Foo()
assert foo.bar() == "Look Ma! No self in this method"