Question

我必须像下面这样上课。

class Reports()
_name = 'reports'
def fetch_transaction_invoice():
    #any logic here

 class Bar():
 _name = 'bar'
 def test_method():
     # here i want to access fetch_transaction_invoice of Reports class.

但是当我尝试跟随

class Bar():
 _name = 'bar'
 def test_method():
     Reports.fetch_transaction_invoice ()

它给了我下面的错误。

TypeError: unbound method fetch_transaction_invoice() must be called with Reports instance as first argument (got nothing instead)

Answer 1

以下通过使用@classmethod装饰器起作用：

 class Reports():
    _name = 'reports'
    @classmethod
    def fetch_transaction_invoice(cls):
        print('fetched')

 class Bar():
    _name = 'bar'
    def test_method(self):
        Reports.fetch_transaction_invoice ()

 Bar().test_method()

打印

 fetched

（由于缩进问题，我不得不对您要尝试的内容进行一些假设。）

在其他类中创建类的实例

1 个答案: