Demo of python static class variable

class_static_variable.py

import random

class Student():
    x = 17

    def __init__(self):
        self.age = random.randint(0, 20)


s = Student()
print s.x  # 17

Student.x = 21
print s.x  # 21

# note x is not a member of the instance
print s.__dict__  # no x


t = Student()
print t.x  # 21

Student.x = 42
print s.x, t.x  # 42, 42