python - 如何在 python 中检索字典中的类对象？

Question

我已经成功地在字典中添加了一个员工类对象。但是我无法从同一个字典中取回值？下面是代码和输出。

源代码:

# decalre a dict
employee_collection = {}

# Class object to store employee's details
class employee:
  # Constructor
  def __init__(self,name,age):
    self.name = name
    self.age  = age

  # Display the object values
  def print_property(self):
    print(f"name is {self.name} and age is {str(self.age)}")

# loop to add multiple employee details
for x in range(1, 6):
  obj= employee("xxx", 28+x)
  employee_collection.update({x : obj})

 # extract the employee detail from  and print the vaue to user
for x in employee_collection:
  # print(x.name)
  print(x)

print(employee_collection)

输出:

1
2
3
4
5
{1: <__main__.employee object at 0x0327F610>, 2: <__main__.employee object at 0x03550C70>, 3: <__main__.employee object at 0x03550580>, 4: <__main__.employee object at 0x035503B8>, 5: <__main__.employee object at 0x03550FB8>}

我的问题是:如何在 main 方法中使用循环打印姓名和年龄？

Answer 1

两种方法。 dict 正在存储每个 employee 的 instance(顺便说一句，应该是 Employee)。

您可以打印实例的属性，或者更改尝试打印对象时发生的情况。

前者:

for key, e in employee_collection.items():
    print(f'{x} {e.name} {e.age}')

后者:

class Employee:
    ...

    def __str__(self):
        return f'{self.name} {self.age}'


for e in employee_collection.values():
    print(e)