Definition and use of classes in Python

Goal:

1. Definition of class

2. Parent class, subclass definition, and subclass call parent class

3. Combined use of classes

4. Built-in features

1. Definition of class

The code is as follows:

#!/usr/bin/env Python#coding:utf8class Hotel (object): "" "DocString for Hotel" ""    def __init__ (self, guest, cf= 1.0, Br=15):        self.room = guest        self.cf = CF        self.br = BR    def cacl_all (self, Days=1):        return ( Self.room * SELF.CF + self.br) * Daysif __name__ = "__main__":    stdroom = Hotel (big_room)    = Hotel (0.9) 
   print stdroom.cacl_all ()    print Stdroom.cacl_all (2)    print big_room.cacl_all ()    print Big_room.cacl _all (3)    

2. Parent class, child class, and calling parent class

The code is as follows:

#!/usr/bin/env python#-*-coding:utf-8-*-# Parent class Addbook (object):    def __init__ (self, Name, phone):        Self.name = name        Self.phone = Phone    def get_phone (self):        return self.phone# subclass, inheriting class Emplemail (Addbook):    def __init__ (self, NM, ph, e-mail):        # addbook.__init__ (self, NM, ph) # Call the parent class method a        super (Emplemail, self). __init __ (nm, ph) # Call the parent class method two        Self.email = email    def get_email (self):        return self.email# call if __name__ = = "__main__ ":    Detian = Addbook (' Handetian ', ' 18210413001 ')    Meng = Addbook (' Shaomeng ', ' 18210413002 ')    print Detian.get_phone ()    print Addbook.get_phone (Meng)    alice = Emplemail (' Alice ', ' 18210418888 ', ' [email Protected] ')    print alice.get_email (), Alice.get_phone ()

3. Combined use of classes

The code is as follows:

#!/usr/bin/env python#-*-coding:utf-8-*-"1.class class combination use 2. Mobile phones, e-mail, QQ, etc. can be changed (defined together), the name is immutable (defined separately). 3. Refer to "Class Info" in another class:    def __init__ (self, phone, email, QQ):        self.phone = phone        self.email = Email        self.qq = QQ    def get_phone (self):        return self.phone    def update_phone (self, newphone):        Self.phone = newphone        print "Phone number change changed"    def get_email (self):        return Self.emailclass Addrbook (object):    "docstring for Addbook"    def __init__ (self, name, phone, email, QQ):        self.name = name        self.info = Info (phone, email, qq) if __name__ = = "__main__":    Detian = Addrbook (' Handetian ', ' 18210413001 ', ' [email protected] ' , ' 123456 ')    print Detian.info.get_phone ()    Detian.info.update_phone (18210413002)    Print Detian.info.get_phone ()    print Detian.info.get_email ()

4. Built-in function (function () plus and no difference)

The code is as follows:

#!/usr/bin/env python#coding:utf8class Books (object):    def __init__ (self, title, author):        self.title = title        Self.author = author    def __str__ (self):        return self.title    def __repr__ (self):        return Self.title    def __call__ (self):        print "%s was written by%s"% (Self.title, self.author) if __name__ = = ' __main__ ':    pybook = Books (' Core Python ', ' Wesley ')    print Pybook    pybook ()

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#!/usr/bin/env python#coding:utf8class number  (object): "" "    Custum object    Add/radd +;     Sub/rsub-;    Mul/rmul *;    Div/rdiv/;    "" " def __init__ (self, number):        self.number = number    def __add__ (self, Other):        return self.number + other            def __radd__ (self, Other):        return self.number  + other    def __sub__ (self, Other):        return Self.number-other    def __rsub__ (self, Other):        return other-self.number    def __gt__ (self, Other):        If Self.number > Other:            return True        return falseif __name__ = = ' __main__ ':    num = number    print num +    print + num    print num-5    print 11-num    print num > 20

Definition and use of classes in Python