dedent.py

from math import sqrt

class Dedent:
  @classmethod
  def method(cls, f=None, *, name=None):
    def decorator(f):
      setattr(cls, name if name is not None else f.__name__, f)
    if f is not None:
      decorator(f)
    else:
      return decorator

class Point(Dedent):
  pass

@Point.method
def __init__(self, x, y):
  self.x = x
  self.y = y

@Point.method(name='__matmul__')
def dot(p, q):
  return p.x * q.x + p.y * q.y
  
print(Point(1, 1) @ Point(1, -1))