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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Python grandchild of .NET class is not created correctly if \"__namespace__\" attribute is set","articleBody":"### Environment\r\n\r\n-   Pythonnet version: 2.3 with #503 applied\r\n-   Python version: 3.4 64-bit\r\n-   Operating System: Ubuntu 14.04\r\n\r\n### Details\r\n\r\n-   Describe what you were trying to get done.\r\n\r\nI am trying to use python child of .NET class in python grandchild.\r\n\r\n-   What commands did you run to trigger this issue? If you can provide a\r\n    [Minimal, Complete, and Verifiable example](http://stackoverflow.com/help/mcve)\r\n    this will help us understand the issue.\r\nFollowing pure python code \r\n```python\r\nclass A:\r\n  def __init__(self):\r\n      self.foo()\r\n  def foo(self): print('A.foo')\r\n\r\nclass B(A):\r\n  def foo(self): print('B.foo')\r\n\r\na = A()\r\nb = B()\r\n```\r\nworks like expected and prints:\r\n\u003e A.foo\r\n\u003e B.foo\r\n\r\nConsider Python classes constructed with pythonnet:\r\n```python\r\nimport clr\r\nimport System.Windows.Forms as WinForms\r\n\r\nclass PythonGroupBox(WinForms.GroupBox):\r\n    def __init__(self):\r\n        print(\"PythonGroupBox.__init__\")\r\n        self.MyInit()\r\n\r\n    def MyInit(self):\r\n        print(\"PythonGroupBox MyInit\")\r\n\r\nclass PythonGroupBoxDerived(PythonGroupBox):\r\n    def MyInit(self):\r\n        print(\"PythonGroupBoxDerived MyInit\")\r\n\r\ngrp1 = PythonGroupBox()\r\ngrp2 = PythonGroupBoxDerived()\r\n```\r\nworks fine and prints:\r\n\u003e PythonGroupBox.__init__\r\n\u003e PythonGroupBox MyInit\r\n\u003e PPythonGroupBox.__init__\r\n\u003e PythonGroupBoxDerived MyInit\r\n\r\nNow the same with \"__namespace__\":\r\n```python\r\nimport clr\r\nimport System.Windows.Forms as WinForms\r\n\r\nclass PythonGroupBox(WinForms.GroupBox):\r\n    __namespace__ = \"System.Windows.Forms\"\r\n    def __init__(self):\r\n        print(\"PythonGroupBox.__init__\")\r\n        self.MyInit()\r\n\r\n    def MyInit(self):\r\n        print(\"PythonGroupBox MyInit\")\r\n\r\nclass PythonGroupBoxDerived(PythonGroupBox):\r\n    def MyInit(self):\r\n        print(\"PythonGroupBoxDerived MyInit\")\r\n\r\ngrp1 = PythonGroupBox()\r\ngrp2 = PythonGroupBoxDerived()\r\n```\r\nThe output is:\r\n\u003e PythonGroupBox.__init__\r\n\u003e PythonGroupBox MyInit\r\n\u003e PythonGroupBox.__init__\r\n\u003e PythonGroupBox MyInit\r\n\r\nError (1), because MyInit Method didn't get overloaded !!!\r\n\r\nOne more try:\r\n```python\r\nimport clr\r\nimport System.Windows.Forms as WinForms\r\n\r\nclass PythonGroupBox(WinForms.GroupBox):\r\n    __namespace__ = \"System.Windows.Forms\"\r\n    def __init__(self):\r\n        print(\"PythonGroupBox.__init__\")\r\n        self.MyInit()\r\n\r\n    def MyInit(self):\r\n        print(\"PythonGroupBox MyInit\")\r\n\r\nclass PythonGroupBoxDerived(PythonGroupBox):\r\n    __namespace__ = \"System.Windows.Forms\"\r\n    def MyInit(self):\r\n        print(\"PythonGroupBoxDerived MyInit\")\r\n\r\ngrp1 = PythonGroupBox()\r\ngrp2 = PythonGroupBoxDerived()\r\n```\r\nOutput gets really weird:\r\n\u003e PythonGroupBox.__init__\r\n\u003e PythonGroupBox MyInit\r\n\r\nError (2): during construction of PythonGroupBoxDerived the __init__() method was not called at all !!!\r\n\r\nImportant: this issue has nothing to do with issue #503: if I undo that fix than constructors get called twice, but errors described here persist.","author":{"url":"https://github.com/testrunner123","@type":"Person","name":"testrunner123"},"datePublished":"2017-09-15T09:51:48.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/544/pythonnet/issues/544"}