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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"adding a new @classmethod to an existing class","articleBody":"I have a python programming issue which I have not solved. \n \nIn python3, using 'from opencadd.structure.core import Structure'\n\ndefines the class Structure. The section of the Structure code that I need to modify is\n\n    @classmethod\n    @redo.retriable(attempts=10, sleeptime=2)\n    def from_pdbid(cls, pdbid):\n        import mmtf\n\n        return cls(mmtf.fetch(pdbid))\n\nwhere I would like to include\n\n    # New method for CIF files\n    @classmethod\n    def from_cif(cls, filepath: str):\n        \"\"\"\n        Create a Structure object from a local CIF file.\n        \"\"\"\n        parser = MMCIFParser()\n        structure_data = parser.get_structure(\"cif_file\", filepath)\n        # ... (processing to build Volkamer Structure object)\n        return cls(atoms, residues, bonds)\n\nThis will skip trying to execute mmtf.fetch (which will timeout because pdb is no longer available for mmtf.fetch).\nInstead using Structure.from_cif will avoid this issue and retrieve the file. \n\nSo far, I have not been able to do this successfully. Many blogs offer suggestions about adding a classmethod, \nbut I have failed and am asking for help from python exports. \n\nThanks in advance,\nDavid\nFortran, R, Matlab, C, AWK, Perl, no Python\n\n\n","author":{"url":"https://github.com/llevoc","@type":"Person","name":"llevoc"},"datePublished":"2025-09-19T19:01:23.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/1173/python-guide/issues/1173"}