__author__ = 'mare'
class MyClass:
""" very simple class """
pass
class Person:
Name = "Default Name"
def Print(self):
print("My name is {0}".format( self.Name ))
p1 = Person()
p1.Print()
p1.Name = "yuna"
p1.Print()
#My name is Default Name
#My name is yuna
#class object and instance object namespace
class Person:
name = "default name"
p1 = Person();
p2 = Person();
print("p1's name: ", p1.name)
print("p2's name: ", p2.name)
#p1's name: default name
#p2's name: default name
p1.name = "yuna kim"
print("p1's name: ", p1.name)
print("p2's name: ", p2.name)
#p1's name: yuna kim
#p2's name: default name
#new member create
Person.title = "new title"
print("p1's title: ", p1.title)
print("p2's title: ", p2.title)
#p1's title: new title
# p2's title: new title
print("Person's title: ", Person.title)
#Person's title: new title
p1.age = 20
print("p1's age", p1.age)
#p1's age 20
#print("p2's age", p2.age)
#error!!!
#AttributeError: 'Person' object has no attribute 'age'
#notice self keyword
str = "Not class member"
class GString:
str = ""
def set(self, msg):
self.str = msg
def Print(self):
print(str)
g = GString()
g.set("First Message")
g.Print()
#Not class member
#exception keyword, __class__
class Test:
data = "Default"
i2 = Test();
i1 = Test();
i1.__class__.data = "all data will be changed"
print(i1.data)
print(i2.data)
#all data will be changed
#all data will be changed
i2.data = "only i2's data is changed"
print(i1.data)
print(i2.data)
#all data will be changed
#only i2's data is changed
#relationship class object and instance object
class Person:
pass
class Bird:
pass
class Student:
pass
p, s = Person(), Student()
print( isinstance(p, Person) )
#True
print( isinstance(s, Person) )
print( isinstance(p, object) )
print( isinstance(p, Bird) )
print( isinstance(int, object) )
#False
#True
#False
#True
#creator and deleter
class MyClass:
def __init__(self, value):
self.Value = value
print("Class is created! value = ", value)
def __del__(self):
print("Class is deleted")
def foo():
d = MyClass(10)
foo()
#Class is created! value = 10
#Class is deleted
#static method, class method
class CounterManager:
insCount = 0
def __init__(self):
CounterManager.insCount += 1
def printInstanceCount():
print("Instance Count: ", CounterManager.insCount)
a, b, c = CounterManager(), CounterManager(), CounterManager()
CounterManager.printInstanceCount()
#Instance Count: 3
#b.printInstanceCount()
#error
# rewrite rightly
print("---")
class CounterManager:
insCount = 0
def __init__(self):
CounterManager.insCount += 1
def staticPrintCount():
print("Instance Count: ", CounterManager.insCount)
SPrintCount = staticmethod(staticPrintCount)
def classPrintCount(cls):
print("Instance Count: ", cls.insCount)
CPrintCount = classmethod(classPrintCount)
a, b, c = CounterManager(), CounterManager(), CounterManager()
CounterManager.SPrintCount()
b.SPrintCount()
CounterManager.CPrintCount()
b.CPrintCount()
#Instance Count: 3
#Instance Count: 3
#Instance Count: 3
#Instance Count: 3
#operator re define
class GString:
def __init__(self, init=None):
self.content = init
def __add__(self, str):
self.content += str;
def __sub__(self, str):
for i in str:
self.content = self.content.replace(i, '')
return GString(self.content)
def __abs__(self):
return GString( self.content.upper() )
def Remove(self, str):
return self.__sub__(str)
g = GString("abcdefgABCD")
print(g.content)
#abcdefgABCD
g+"Apple_"
print(g.content)
#abcdefgABCDApple_
g -= "ade"
print(g.content)
#bcfgABCDAppl_
g -= "QQQ"
print(g.content)
#bcfgABCDAppl_
g = abs(g)
print(g.content)
#BCFGABCDAPPL_
#sequence operator redefine
class Sequencer:
def __init__(self, maxValue):
self.maxValue = maxValue
def __len__(self):
return self.maxValue
def __getitem__(self, index):
if( 0 < index <= self.maxValue ):
return index * 10
else:
raise IndexError("Index out of range")
def __contains__(self, item):
return (0 < item <= self.maxValue)
s = Sequencer(5)
print( s[1] )
print( s[3] )
print( [s[i] for i in range(1,6) ] )
#10
#30
#[10, 20, 30, 40, 50]
print( len(s) )
print( 3 in s )
print( 7 in s )
#5
#True
#False
#inheritance
class Person:
" parent class "
def __init__(self, name, phoneNumber):
self.Name = name
self.PhoneNumber = phoneNumber
def PrintInfo(self):
print("Info(Name:{0}, Phone Number: {1}".format(self.Name, self.PhoneNumber))
def PrintPersonData(self):
print("Person(Name:{0}, Phone Number:{1})".format(self.Name, self.PhoneNumber))
class Student(Person):
"child class"
def __init__(self, name, PhoneNumber, subject, studentID):
self.Name = name
self.PhoneNumber = PhoneNumber
""" #call creator in parent class
Person.__init__(self, name, phoneNumber)
"""
self.Subject = subject
self.StudentID = studentID
#method addition
def PrintStudentData(self):
print("Student(subject: {0}, Student ID: {1})".format(self.Subject, self.StudentID))
p = Person("Derick", "010-123-4556")
s = Student("Marry", "010-123-2222", "Computer science", "990999")
print( p.__dict__ )
#{'Name': 'Derick', 'PhoneNumber': '010-123-4556'}
print( s.__dict__ )
#{'Subject': 'Computer science', 'Name': 'Marry', 'PhoneNumber': '010-123-2222', 'StudentID': '990999'}
print( issubclass(Student, Person) )
print( issubclass(Person, Student) )
print( issubclass(Person, Person) )
print( issubclass(Person, object))
print( issubclass(Student, object))
#True
#False
#True
#True
#True
print( s.PrintStudentData() )
#Student(subject: Computer science, Student ID: 990999)
print( dir(s) )
#Method overriding
class Student2(Person):
"child class"
def __init__(self, name, PhoneNumber, subject, studentID):
self.Name = name
self.PhoneNumber = PhoneNumber
self.Subject = subject
self.StudentID = studentID
#method addition
def PrintStudentData(self):
print("Student(subject: {0}, Student ID: {1})".format(self.Subject, self.StudentID))
def PrintInfo(self):
print("Info(Name:{0}, Phone Number: {1}".format(self.Name, self.PhoneNumber))
print("Student(subject: {0}, Student ID: {1})".format(self.Subject, self.StudentID))
s = Student2("Marry", "010-123-2222", "Computer science", "990999")
print( s.PrintInfo() )
#Info(Name:Marry, Phone Number: 010-123-2222
#Student(subject: Computer science, Student ID: 990999)
#method extension
class Student3(Person):
"child class"
def __init__(self, name, PhoneNumber, subject, studentID):
self.Name = name
self.PhoneNumber = PhoneNumber
self.Subject = subject
self.StudentID = studentID
#method addition
def PrintStudentData(self):
print("Student(subject: {0}, Student ID: {1})".format(self.Subject, self.StudentID))
def PrintInfo(self):
Person.PrintInfo(self)
print("Student(subject: {0}, Student ID: {1})".format(self.Subject, self.StudentID))
s = Student3("Marry", "010-123-2222", "Computer science", "990999")
print( s.PrintInfo() )
#Info(Name:Marry, Phone Number: 010-123-2222
#Student(subject: Computer science, Student ID: 990999)
#calss inheritance space and namespace
class SuperClass:
x=10
def printX(self):
print(self.x)
class SubClass(SuperClass):
y=20
def printY(self):
print(self.y)
s = SubClass()
s.a = 30
print( s.__dict__ )
#{'a': 30}
print( s.y )
print( s.x )
#20
#10
class SuperClass:
x=10
def printX(self):
print(self.x)
class SubClass(SuperClass):
y=20
def printY(self):
print(self.y)
def printX(self):
print("subClass:", self.x)
s = SubClass()
s.a = 30
s.x = 50
print("SuperClass: ", SuperClass.__dict__ )
print("SubClass: ", SubClass.__dict__ )
print("S: ", s.__dict__ )
"""
SuperClass: {'__weakref__': , '__module__': '__main__', '__doc__': None, 'x': 10, '__dict__': , 'printX': }
SubClass: {'__module__': '__main__', 'y': 20, '__doc__': None, 'printY': , 'printX': }
S: {'a': 30, 'x': 50}
"""
#multi inheriance
class Tiger:
def Jump(self):
print(" jump far like tiger")
class Lion:
def Bite(self):
print("bite like lion")
def Cry(self):
print("zzzz")
class Liger(Tiger, Lion):
def Play(self):
print("play with liger")
l = Liger()
l.Jump()
l.Bite()
l.Play()
#jump far like tiger
#bite like lion
#play with liger
l.Cry()
#zzzz
class Animal:
def __init__(self):
print("Animal __init()")
class Tiger(Animal):
def __init__(self):
Animal.__init__(self)
print("Tiger __init()")
class Lion(Animal):
def __init__(self):
Animal.__init__(self)
print("Lion __init()")
class Liger(Tiger, Lion):
def __init__(self):
Tiger.__init__(self)
Lion.__init__(self)
print("liger __init()")
l = Liger()
#Animal __init()
#Tiger __init()
#Animal __init()
#Lion __init()
#liger __init()
# rewrite by super init
class Animal2:
def __init__():
print("Animal __init()")
class Tiger2(Animal):
def __init__(self):
super().__init__()
print("Tiger __init()")
class Lion2(Animal):
def __init__(self):
super().__init__()
print("Lion __init()")
class Liger2(Tiger2, Lion2):
def __init__(self):
super().__init__()
print("liger __init()")
print("---")
l = Liger2()
#Animal __init()
#Lion __init()
#Tiger __init()
#liger __init()
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