Question

目标：我想根据用户输入从类中返回一个属性。

具体地说，我为足球俱乐部创建了一个类，并添加了一些团队。我想问用户他最喜欢的球队是什么，然后打印他最喜欢的球队的属性，例如该球队的最佳球员。

因此，如果用户输入“ Liverpool”，则需要将我的fotballclub类中的答案与“ Liverpool”进行匹配，并返回bestplayer属性。

类似的东西：

class Club:

    def __init__(self, name, kitcolor, bestplayer):
        self.name = name
        self.kitcolor = kitcolor
        self.bestplayer = bestplayer

Liverpool = Club("Liverpool", "red", "Salah")
Chelsea = Club("Chelsea", "blue", "Azpilicueta")

favorite_team = input("What is your favorite team in Premier League?")

EXAMPLE print("The best player of your favorite team is " + Liverpool.bestplayer)

任何想法，将不胜感激，谢谢。

Answer 1

一种简单的方法是将实例放入字典中

name2club = {}

# create Clubs

name2club[Liverpool.name] = Liverpool
name2club[Chelsea.club] = Chelsea

favorite_team = input("What is your favorite team in Premier League?")

print(f"The best player of your favorite team is {name2club[favorite_team].bestplayer}.")

如果字典是class属性，则可能会更方便：

class Club:

    name2club = {}

    def __init__(self, name, kitcolor, bestplayer):
        self.name = name
        self.kitcolor = kitcolor
        self.bestplayer = bestplayer
        self.name2club[name] = self

Liverpool = Club("Liverpool", "red", "Salah")
Chelsea = Club("Chelsea", "blue", "Azpilicueta")

favorite_team = input("What is your favorite team in Premier League?")
print(f"The best player of your favorite team is {Club.name2club[favorite_team].bestplayer}.")

Answer 2

您可以使用eval在运行时获取对象。当对象不存在时，将引发“ NameError”错误。

class Club:

    def __init__(self, name, kitcolor, bestplayer):
        self.name = name
        self.kitcolor = kitcolor
        self.bestplayer = bestplayer

Liverpool = Club("Liverpool", "red", "Salah")
Chelsea = Club("Chelsea", "blue", "Azpilicueta")

favorite_team = input("What is your favorite team in Premier League?")
try:
  print("The best player of your favorite team is " + eval(favorite_team).bestplayer)
except NameError:
  print(favorite_team + " data not in this program")

Python：如何根据用户输入打印对象属性

2 个答案: