[Level 2] Python variable scope.

If you want to have a private property in Python class,
you can add an prefix '__' before your variable.

e.g.

in ./lib/libcomm.py

class common:

    def __init__(self, name='stanley', age=25):
        self.__name = name
        self.__age = age
   
    def setName(self, name):
        self.__name = name
   
    def getName(self):
        return self.__name
   
    def setAge(self, age):
        self.__age = age
   
    def getAge(self):
        return self.__age 

in ./test.py

from lib.libcommon import *

if __name__ == '__main__':

    c = common('stanley', 24)
    try:
        print c.__age
    except Exception, e:
        print e
    print c.getAge()

    c.__age = 1
    print c.__age

    c.setAge(10)
    print c.__age
    print c.getAge()

result:

common instance has no attribute '__age'
24
1
1
10

Wish this helps.
regards,
Stanley Huang