如何使对象的列表元素实例

如何解决如何使对象的列表元素实例

我正在尝试遍历字符串列表，并使每个元素成为对象的实例。 我做了一个简化的版本只是为了演示我的问题。当我运行此代码时，出现一条错误消息，提示未定义“ David”。我知道我做错了什么：当我写“ People [i] = Person（）”时，People [i]成为变量名，而不是调用列表中的每个元素。

如何调用列表中的每个元素并将其设为变量，以便在这种情况下，当我打印（David.name）时，它将打印“ David”？

class Person:
    def __init__(self):
        self.name = "Unassigned"



People = ["David","Emma","Brian"]

for i in range(len(People)):
    People[i] = Person()
 
print(David.name)

解决方法

以下是您可以尝试的上述代码段的调整

class Person:
    # init constructor
    def __init__(self,name):
        self.name = name

People = ["David","Emma","Brian"]

# instead of creating dynamic variable use a dict
peoples = {}

for p in People:
    # init object with person name
    peoples[p] = Person(p)
 
# access based on person name
print(peoples['David'].name)

,

要动态创建变量，这不是一个好主意。您可以做到的方式如下：

people = ["David","Brian"]

code = "class {name}:\n    pass\n{name}.name = '{name}'"
for name in people:
    exec(code.format(name = name),globals())

print(David.name)
#prints:
#'David'

,

请勿分配这样的变量名或与全局变量混淆。改用字典：

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jqueryui/1.12.1/jquery-ui.min.js"></script>
<div>
  <h1>
    base base base
  </h1>
  <div id="test">
    <h3>
      aaaaaaaaaaaaaaa
    </h3>
    <button>test</button>
  </div>
</div>