> class people: 

...   def speak(self): 

...       print ("hello!") 

...

'''

'''  
> class people:          #类  
...   def speak(self):      #方法        
...       print ("hello!")        
... 
> 

> jack = people()  #创建jack实例
> tom = people()  #创建tom实例
> import tab    #导入table键功能模块
> jack.      #输入jack.，可以看到以下方法
jack.__class__  jack.__doc__   jack.__module__ jack.speak(   
> jack.speak()  #引用speak方法
hello!

> jack.age=39      #添加age属性
> jack.height=120    #添加height属性
> jack.
jack.__class__  jack.__module__ jack.height   
jack.__doc__   jack.age     jack.speak(   
> jack.height
120
> jack.age
39

'''

'''
> class peo:
...   def __init__(self,name,age,sex):
...       self.Name = name
...       self.Age = age
...       self.Sex = sex
...   def speak(self):
...       print "my name" + self.Name
... 
> 

实例化这个类的对象时：
> zhangsan=peo("zhangsan",24,'man')
> print zhangsan.Age
24
> print zhangsan.Name
zhangsan
> print zhangsan.Sex
man

# ----------
> print zhangsan
<__main__.peo instance at 0x7fe5041ec248>
''' 

'''
#! /usr/bin/python
class peo:
  def __init__(self,name,age,sex):
    self.Name = name
    self.Age = age
    self.Sex = sex
  def speak(self):
    print "my name" + self.Name
  def __str__(self):
    msg='my name is: ' +self.Name+ ","+ "my age is: " + self.Age +','+ "my sex is:" +self.Sex
    # msg='my name is: ' +self.Name+ ","+ "my age is: " + str(self.Age) +','+ "my sex is:" +self.Sex
    return msg
shanghai=peo('shanghai','23','man')
# shanghai=peo('shanghai',23,'man')
'''
msg='my name is: ' +self.Name+ ","+ "my age is: " + self.Age +','+ "my sex is:" +self.Sex