使用Python在運行時動態地向類添加屬性

Question

當我執行以下操作時：

def Welcome(email, temporaryPassword):
    model = object()
    model.TemporaryPassword = temporaryPassword
    model.Email = email

我收到一個錯誤：

AttributeError: 'object' object has no attribute 'TemporaryPassword'

如何像我一樣動態創建對象？

Answer 1

使用lambda對象：（ http://codepad.org/ITFhNrGi ）

def Welcome(email, temporaryPassword):
    model = type('lamdbaobject', (object,), {})()
    model.TemporaryPassword = temporaryPassword
    model.Email = email
    return model


t = Welcome('a@b.com','1234')
print(str(t.TemporaryPassword))

Answer 2

您可以先定義一個虛擬類：

class MyObject(object):
    pass

obj = MyObject()
obj.TemporaryPassword = temporaryPassword

Answer 3

如果僅將對象用作數據結構（即沒有方法），則可以使用collections包中的namedtuple ：

from collections import namedtuple
def welcome(email, tmp_passwd):
    model = namedtuple('MyModel', ['email', 'temporary_password'])(email, tmp_passwd)
    ...

順便說一句，如果您的welcome函數僅創建並返回對象，則不需要它。 只是：

from collections import namedtuple
Welcome = namedtuple('Welcome', ['email', 'temporary_password'])

ex = Welcome('me@example.com', 'foobar')
print ex.email
print ex.temporary_password