在oop【物件導向程式設計——object oriented programming】程式設計中，定義乙個class的時候，可以從現有的class繼承，新的class稱為子類（subclass），而被繼承的class稱為基類、父類或超類（base class、super class）
class
animal
(object):
defrun
(self)
:print
('animal is running'
)animal = animal(
)animal.run(
)c:\users\33066\pycharmprojects\untitled\venv\scripts\python.exe c:
/users/
33066
/desktop/nine.py
animal is running
process finished with exit code 0
class
animal
(object):
defrun
(self)
:print
('animal is running'
)class
dog(animal)
:def
run(self)
:print
('dog is running'
)class
cat(animal)
:def
run(self)
:print
('dog is running'
)animal=animal(
)dog=dog(
)cat=cat(
)animal.run(
)dog.run(
)cat.run(
)c:\users\33066\pycharmprojects\untitled\venv\scripts\python.exe c:
/users/
33066
/desktop/nine.py
animal is running
dog is running
dog is running
process finished with exit code 0
class
animal
(object):
defrun
(self)
:print
('animal is running'
)class
dog(animal)
:pass
class
cat(animal)
:pass
dog=dog(
)dog.run(
)cat=cat(
)cat.run(
)c:\users\33066\pycharmprojects\untitled\venv\scripts\python.exe c:
/users/
33066
/desktop/nine.py
animal is running
animal is running
process finished with exit code 0
用isinstance()可以判斷變數是什麼資料類# 多型
類似於python的其他資料型別，list、dict、str，class所編寫的類也是一種資料型別
用isinstance()可以判斷變數是什麼資料型別
子類增加方法
當子類的方法與父類的方法同名時，直接呼叫子類的方法
class
animal
(object):
defrun
(self)
:print
('animal is running'
)class
dog(animal)
:def
eat(self)
:print
('dog is eat'
)def
run(self)
:print
('dog is running'
)class
cat(animal)
:def
eat(self)
:print
('cat is eat'
)def
run(self)
:print
('cat is running'
)dog=dog(
)dog.eat(
)dog.run(
)cat=cat(
)cat.eat(
)cat.run(
)c:\users\33066\pycharmprojects\untitled\venv\scripts\python.exe c:
/users/
33066
/desktop/nine.py
dog is eat
dog is running
cat is eat
cat is running
process finished with exit code 0
class animal(object):
def run(self):
print('animal is running')
class dog(animal):
def eat(self):
print('dog is eat')
def run(self):
print('dog is running')
class cat(animal):
def eat(self):
print('cat is eat')
def run(self):
print('cat is running')
a = list() # a是list型別
b = animal() # b是animal型別
c = dog() # c是dog型別
d = cat()#d市cat型別
print(isinstance(a, list))
print(isinstance(b, animal))
print(isinstance(c, dog))
print(isinstance(d, cat))
c:\users\33066\pycharmprojects\untitled\venv\scripts\python.exe c:/users/33066/desktop/nine.py
true
true
true
true
process finished with exit code 0
class
animal
(object):
defrun
(self)
:print
('animal is running'
)class
dog(animal)
:def
run(self)
:print
('dog is running'
)class
cat(animal)
:def
run(self)
:print
('cat is running'
)def
run_
(animal)
: animal.run(
) animal.run(
)run_(animal())
run_(dog())
run_(cat())
class
tortoise
(animal)
:def
run(self)
:print
('tortoise is running'
)run_(tortoise())
c:\users\33066\pycharmprojects\untitled\venv\scripts\python.exe c:
/users/
33066
/desktop/nine.py
animal is running
animal is running
dog is running
dog is running
cat is running
cat is running
tortoise is running
tortoise is running
process finished with exit code 0
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