Understand Constructors in Python Classes

example3.py

class Student(object):

    def __new__(cls, *args, **kwargs):
        print("Running __new__() method.")
        return None

    def __init__(self, first_name, last_name):
        print("Running __init__() method.")
        self.first_name = first_name
        self.last_name = last_name


s1 = Student("Yang", "Zhou")
print(s1.last_name)

# Running __new__() method.
# AttributeError: 'NoneType' object has no attribute 'last_name'