python類的繼承及重寫父類方法

寫python有一年多了，平日使用python解決一些問題，調一些介面，用一些框架，雖然不影響都可以寫，但一直沒有好好的花時間去理解python概念性的東西。也許，這也是寫了這麼久一直不能有所進步的原因，從今天起，來重新好好的學習一下python的相關概念。

class

tree
:def
__init__
(self,name,age)
: self.name = name
self.age = age
defgrow
(self)
:print
("{} tree is growing...now it's {} years old"
.format
(self.name,self.age)
)def
seed
(self)
:print
("{} tree is seeding..."
.format
(self.name)
)class
(tree)
:"""docstring for classname"""
def__init__
(self, name, age, color)
:super()
.__init__(name,age)
self.color = color
defprice
(self)
:print
("one {} tree is 100 dollars"
.format
(self.name)
)class
pear
(tree)
:"""docstring for classname"""
def__init__
(self, name, age, color)
:super()
.__init__(name,age)
self.color = color
defprice
(self)
:print
("one {} {} tree is 80 dollars"
.format
(self.color,self.name)
)def
grow
(self)
:#重寫父類的方法grow生長
print
("it was {} years old,now it is {} years old"
.format
(self.age,
int(self.age)+1
))if __name__ ==
'__main__':,
8,'white'
) a.grow(
) a.seed(
) a.price(
) b = pear(
'pear',8
,'red'
) b.price(
) b.grow(
)>>
>
#one red pear tree is 80 dollars
#it was 8 years old,now it is 9 years old

class

tree:.
....
.def
grow
(self)
:print
("{} tree is growing...now it's {} years old"
.format
(self.name,self.age)
)class
pear
(tree)
: ···
···def
grow
(self)
:#重寫父類的方法grow生長
print
("it was {} years old,now it is {} years old"
.format
(self.age,
int(self.age)+1
))

python2 super

(tree,self)
.__init__(name,age)
python3 super()
.__init__(name,age)

···

···class
orange
(tree)
:def
grow
(self)
:#呼叫父類tree的方法grow
super()
.grow(
)#直接呼叫tree類的方法
tree(
,'16'
).grow(
)#重寫父類方法grow
print
("{} tree has changed..."
.format
(self.name)
)orange(
'orange'
,'15'
)>>
>
#orange tree is growing...now it's 15 years old
#orange tree has changed...

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