class attributes in python

1class MyClass:
2  # Class attributes are defined outside of constructor
3  class_attr = 0
4  
5  def __init__(self, inst):
6    # Instance attributes are defined in the constructor
7    self.instance_attr = inst
8    
9obj = MyClass(1)
10print(obj.class_attr) # outputs 0
11print(obj.instance_attr) # outputs 1
12print(MyClass.class_attr) # outputs 0
13print(MyClass.instance_attr) # raises AttributeError