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[英]Is there a way to access specific attributes in a list of objects in python?
[英]How to access specific object attributes after creating multiple objects? Python
我正在尝试通过创建管理电影商店的OO代码来练习Python编码。 我完成的代码可以正常工作,并且可以完成我想要的事情,但是在我的代码中对象Movie具有2个属性(名称,ncopies),我正在使用一个列表将每个电影名称与自己的ncopies属性相关联,想要通过使用诸如something.name之类的面向对象编程来访问这些属性,这给了我电影的名字,而不是必须维护2个相关列表并且每次我想要获取属性时都必须获取索引,任何想法?
class Movie:
global lista_names
global lista_ncopies
lista_names = [] #list of movie names
lista_ncopies = [] #list of movie copies
def __init__(self, name, ncopies):#keeps movie name and ncopies with same index
self.name = name
self.ncopies = ncopies
lista_names.append(self.name) #append movie name to the list
lista_ncopies.append(self.ncopies) #append ncopies to the list
def showNumberOfCopies():
pesquisa = input("digite o nome")#variable receives the movie name
if pesquisa in lista_names: #checks if its in the movie names list
indice = lista_names.index(pesquisa) #gets its index
print ("num de copias de",pesquisa,"eh ",lista_ncopies[indice])
menu()
def addMovie():
name = input("digite o titulo") #get name of the movie
ncopies = int(input("digite o numero de copias"))#get num of copies
movie1 = Movie(name, ncopies) #create object
menu()
def updateMovie():
pesquisa = input("type the name of the movie ")
if pesquisa in lista_names: #checks if movie is in lista_names
indice = lista_names.index(pesquisa) #gets the index
else:
opcao = input("o filme desejado nao esta em nosso acervo, deseja atualizar outro filme? s/n") #just in case the movie is not in lista_names
if opcao == 's' or opcao == 'S':
updateMovie()
else:
menu()
opcao2 = input("update ncopies or movie name? type ncopias/nome")
if opcao2 == 'ncopias':
print ("the number of copies is: ",lista_ncopies[indice])
ncopies_new = int(input("digite o numero de copias novo"))
lista_ncopies[indice] = ncopies_new
menu()
elif opcao2 == 'nome':
print ("name of the movie is",lista_names[indice])
name_new = input("type the new name")
lista_names[indice] = name_new
print (lista_names)
menu()
def menu():
opcao = int(input('1-add filme\n2-search filme\n3-update\n4-exit'))
if opcao == 1:
addMovie()
elif opcao == 2:
showNumberOfCopies()
elif opcao == 3:
updateMovie()
elif opcao == 4:
quit
else:
menu()
menu()
您可以改用dict object()将影片名称映射到ncopies。 就像是
class Movie:
global m_dict
m_dict = {} #dict object
def __init__(self, name, ncopies):#keeps movie name and ncopies with same index
self.m_dict = m_dict
m_dict[name] = ncopies #The other way if you wish
然后您可以像M.m_dict
这样M.m_dict
并在dict中查找映射到副本数的电影的名称
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