python class

#!/usr/local/bin/python$
class Person:$
    population=0$
    def __init__(self,name):$
        self.name=name$
        Person.population+=1$
    def sayHi(self):$
        print "Hello,how are you? my name is ", self.name$
    def __del__(self):$
        print "%s say bye." %(self.name)$
        Person.population-=1$
        if Person.population==0:$
           print 'I am the last one.'$
        else :           $
            print "there are still %d people left." % Person.population$
    def howMany(self):$
        if  Person.population==1:$
           print 'I am the only person here.'$
        else :$
            print "we  have  %d people here." % Person.population$
###$
p1=Person('taohx')$
print p1$
p1.sayHi()$
p1.howMany()$
#$
p2=Person('m2')$
print p2$
p2.sayHi()$
p2.howMany()$

 

示例2：###

#!/usr/bin/python
# Filename: inherit.py

class SchoolMember:
    '''Represents any school member.'''
    def __init__(self, name, age):
        self.name = name
        self.age = age
        print '(Initialized SchoolMember: %s)' % self.name

    def tell(self):
        '''Tell my details.'''
        print 'Name:"%s" Age:"%s"' % (self.name, self.age),

class Teacher(SchoolMember):
    '''Represents a teacher.'''
    def __init__(self, name, age, salary):
        SchoolMember.__init__(self, name, age)
        self.salary = salary
        print '(Initialized Teacher: %s)' % self.name

    def tell(self):
        SchoolMember.tell(self)
        print 'Salary: "%d"' % self.salary

class Student(SchoolMember):
    '''Represents a student.'''
    def __init__(self, name, age, marks):
        SchoolMember.__init__(self, name, age)
        self.marks = marks
        print '(Initialized Student: %s)' % self.name

    def tell(self):
        SchoolMember.tell(self)
        print 'Marks: "%d"' % self.marks

t = Teacher('Mrs. Shrividya', 40, 30000)
s = Student('Swaroop', 22, 75)

print # prints a blank line

members = [t, s]
for member in members:
    member.tell() # works for both Teachers and Students