最新回答 / high_flyer_1_葉猴
當子類沒有def who(self)函數(shù) 此時可以使用父類的def who(self)函數(shù) 如果子類本身有就不用了
2021-05-01
最贊回答 / 樹懶先生QAQ
@是裝飾符以原文為例，先定義了一個log()函數(shù)。把想要裝飾函數(shù)factorial()上一行寫上 @log，就完成了用log()函數(shù)里的內容去“”裝飾“”factorial()函數(shù)里的內容。通過@裝飾符，可以修飾某函數(shù)，使其完成自己想要的額外的功能
2021-04-22
with open('./text.txt','a+') as f1:
f1.seek(0)
lines=f1.readlines()
f1.seek(2)
for v in lines:
f1.write(v)
f1.seek(0)
lines=f1.readlines()
f1.seek(2)
for v in lines:
f1.write(v)
2021-04-15
import math
x=math.sin(0)
from math import cos
y=cos(0)
print(x,y)
x=math.sin(0)
from math import cos
y=cos(0)
print(x,y)
2021-04-14
class Student():
def __init__(self,name,gender,score):
self.name,self.gender=name,gender
self.score=score
def __str__(self):
return 'Student:{},{},{}'.format(self.name,self.gender,self.score)
s=Student('xiaowang','girl','98')
print(str(s))
def __init__(self,name,gender,score):
self.name,self.gender=name,gender
self.score=score
def __str__(self):
return 'Student:{},{},{}'.format(self.name,self.gender,self.score)
s=Student('xiaowang','girl','98')
print(str(s))
2021-04-13
print(isinstance(t,Person))
print(isinstance(t,Student))
print(isinstance(t,Teacher))
print(isinstance(t,object))
print(isinstance(t,Student))
print(isinstance(t,Teacher))
print(isinstance(t,object))
2021-04-12
最贊回答 / 小白兔cai
定義函數(shù)?def __init__(self, ? , ?):函數(shù)是寫成了? ?def __int__(self, ? , ? ):改寫為? ?def __init__(self, ? , ? ):
2021-04-11
class Animal():
_count=0
@classmethod
def get_count(cls):
Animal._count+=1
return cls._count
print(Animal.get_count())
print(Animal.get_count())
_count=0
@classmethod
def get_count(cls):
Animal._count+=1
return cls._count
print(Animal.get_count())
print(Animal.get_count())
2021-04-11
class Animal(object):
def __init__(self, name, age):
self.name = name
self.age = age
dog = Animal("小黃", 2)
cat = Animal("小花", 3)
print(dog.name,dog.age)
print(cat.name,cat.age)
def __init__(self, name, age):
self.name = name
self.age = age
dog = Animal("小黃", 2)
cat = Animal("小花", 3)
print(dog.name,dog.age)
print(cat.name,cat.age)
2021-04-09
class Animal():
count=0
def __init__(self,name,age):
self.name=name
self.age=age
Animal.count+=1
dog=Animal('wangwang','2years old')
cat=Animal('mimi','1yeaes old')
print(Animal.count)
count=0
def __init__(self,name,age):
self.name=name
self.age=age
Animal.count+=1
dog=Animal('wangwang','2years old')
cat=Animal('mimi','1yeaes old')
print(Animal.count)
2021-04-09