Python 3.7 data classes

dataclasses_example.py

# Old
class MyClass:
  def __init__(self, member_init1: int, member_init2: int, member_init3: int):
    self.member1 = member_init1
    self.member2 = member_init2
    self.member3 = member_init3
    print('MyClass initialized')
    
  def __str__(self):
    print('member1: ', self.member1, ' member2: ', self.member2, ' member3: ', self.member3)
    
  def __eq__(self, other):
    return self.member1 == other.member1 and self.member2 == other.member2 \
      and self.member3 == other.member3
    
# New
@dataclass
class MyDataClass:
  # __init__, __str__, __repr__ and __eq__ auto implemented
  # These are not static! 
  member1: int
  member2: int
  member3: int
    
  def __post_init__(self):
    print('MyDataClass initialized')