Python class definition Inheritance

1 defining a time class with default parameters

classMyTime (object):def __init__(self,hour=21, Minute=13, Second=50): Self.hour=hour Self.minute=minute Self.second=Seconddef __str__(self):return '__str__ Hour:minute:second =%02d:%02d:%02d'                %(Self.hour,self.minute,self.second)defGet_hour (self):returnSelf.hourdefGet_minute (self):returnSelf.minutedefGet_second (self):returnSelf.seconddefPrint_time (self):Print  'Hour:minute:second =%02d:%02d:%02d'%(Self.hour,self.minute,self.second)

Description: Constructor__init__ (self,hour=21, minute=13, second=50) with the default parameters defined way; function __str__ for output a method for obtaining a property value Get_xxxxmethods for outputting attribute values print_time 2 Defining a DateTime class, inheriting the properties and methods of the time class

Class Mydatetime (MyTime):    def __init__ (self,year = 2016,mounth = 1,day = 1,                       hour=21, minute=13,second=50):        Super (Mydatetime,self) __init__ (hour,minute,second)        self.year = year        self.mounth = Mounth        self.day = Day            def __str__ (self):        return ' __str__ year--mounth--day =%02d--%02d--%02d '                % (Self.year,self.mounth, Self.day)        def __del__ (self): "" "        __del__ mydatetime Destroyed" ""        print "__del__ mydatetime destroyed" C12/>def print_date (self):        print  ' year-mounth-day =%04d-%02d-%02d '         % (Self.year,self.mounth, Self.day) #        Self.print_time ()  

Description: Mydatetime inherits the MyTime property value, here Mydatetime (subclass), MyTime (parent class) constructor__init__ (self,year = 2016,mounth = 1,day = 1, hour=21, minute=13,second=50) is defined with default parameters, note that the Parent property value is initialized by super; function __str__ for output methods for outputting attribute values print_date 3 Testing

if __name__ = = ' __main__ ':    print "\ n"    print "--" *10, "MyTime t0:"       t0 = mytime ()    print t0    t0.print_ Time ()    print t0.get_hour ()        print "\ n"    print "--" *10, "MyTime T1:"         t1 = mytime (hour=7,second=20)    t1.print_time ()        print "\ n"    print "--" *10, "Mydatetime da:"       da = mydatetime (minute=40)    Print da#    da.print_date ()    da.print_time ()    del da

Test output

>>> runfile (' f:/python/hysrc_py/untitled0_class.py ', wdir=r ' f:/python/hysrc_py ')--------------------  mytime t0:__str__ hour:minute:second = 21:13:50hour:minute:second = 21:13:5021--------------------  mytime T1 : Hour:minute:second = 07:13:20--------------------  

Python class definition Inheritance