Differences between Class Attribute and Instance Attribute of Python

example2.py

class MyClass(object):
     class_attr = 0
     def __init__(self, instance_attr):
      self.instance_attr = instance_attr
        
MyClass.class_attr
# 0
MyClass.instace_attr
# Traceback (most recent call last):
#   File "/usr/lib/python3.6/code.py", line 91, in runcode
#     exec(code, self.locals)
#   File "<input>", line 1, in <module>
# AttributeError: type object 'MyClass' has no attribute 'instace_attr'
my_instance = MyClass(1)
my_instance.instance_attr
# 1
my_instance.class_attr
# 0