class Person:
  def __init__(self, name):
    self.name = name
  
  def greet(self, other_name):
    return "Hi {0}, my name is {1}".format(other_name, name)

NameError: global name 'name' is not defined

class Person:
  def __init__(self, name):
    self.name = name
  
  def greet(self, other_name):
    print("Hi {0}, my name is {1}".format(other_name, self.name))