define class attribute in python code example

Example 1: python define class

class uneclasse():
  def __init__(self):
    pass
  def something(self):
    pass
xx = uneclasse()
xx.something()

Example 2: class in python

2+3j
(5, 0, 10)
Traceback (most recent call last):
  File "<string>", line 27, in <module>
    print(num1.attr)
AttributeError: 'ComplexNumber' object has no attribute 'attr'