从boost:：python生成的python类继承

我在继承使用boost:：python生成的python类时遇到问题

我有一个类，其函数Print（）的定义如下：

void CMagnet::Print()
{
  cout << "Hello" << endl;
}

我得到的是：

hirbel>python der_test.py

Hello

Traceback (most recent call last):
  File "der_test.py", line 10, in <module>
    b = DerMagnet()
  File "der_test.py", line 5, in __init__
    self.Print()
Boost.Python.ArgumentError: Python argument types in
    CMagnet.Print(DerMagnet)
did not match C++ signature:
    Print(CMagnet {lvalue})

你好 回溯（最近一次呼叫最后一次）： 文件“deru test.py”，第10行，在 b=德马涅特（） 文件“der_test.py”，第5行，在_init中__ self.Print（） ArgumentError:中的Python参数类型 CMagnet.Print（Demagnet） 与C++签名不匹配： 打印（CMagnet{lvalue}） 这意味着当我实例化CMagnet类时，我可以毫无问题地调用Print（）方法，但是当我从中继承并且派生类尝试调用该方法时，自参数会自动插入为第一个参数，签名是错误的。我将如何解决这个问题

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非常感谢您的帮助。

我确认@kerim评论

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如果您没有调用父类“\uuu init\uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu

from CMagnet import CMagnet

class DerMagnet(CMagnet):
    def __init__(self):
        self.Print()

a = CMagnet()
a.Print()

b = DerMagnet()

Hello

Traceback (most recent call last):
  File "der_test.py", line 10, in <module>
    b = DerMagnet()
  File "der_test.py", line 5, in __init__
    self.Print()
Boost.Python.ArgumentError: Python argument types in
    CMagnet.Print(DerMagnet)
did not match C++ signature:
    Print(CMagnet {lvalue})