def guess_all_extensions(self, type, strict=True):
        """Guess the extensions for a file based on its MIME type.

        Return value is a list of strings giving the possible filename
        extensions, including the leading dot ('.').  The extension is not
        guaranteed to have been associated with any particular data stream,
        but would be mapped to the MIME type `type' by guess_type().

        Optional `strict' argument when false adds a bunch of commonly found,
        but non-standard types.
        """
        type = type.lower()
        extensions = self.types_map_inv[True].get(type, [])
        if not strict:
            for ext in self.types_map_inv[False].get(type, []):
                if extensions not in ext:
                    extensions.append(ext)
        return extensions
dataset/ETHPy150Open azoft-dev-team/imagrium/env/Lib/mimetypes.py/MimeTypes.guess_all_extensions/swapped operands of `not in`