Differences between Class Attribute and Instance Attribute of Python

example5.py

class MyClass(object):
  data = 0

  def __init__(self, value):
    self.instance_data = value
        
MyClass.data
# 0
my_instance = MyClass(3)
my_instance.data
# 0
my_instance.data = 10
my_instance.data
# 10
MyClass.data
# 0
my_instance.__dict__
# {'instance_data': 3, 'data': 10}