def fromString(self, inString):
        """
        Convert a string to a Python object.  Subclasses must implement this.

        @param inString: the string to convert.
        @type inString: C{bytes}

        @return: the decoded value from C{inString}
        """

        Convert a string to a Python object.  Subclasses must implement this.

        @param inString: the string to convert.
        @type inString: C{bytes}

        @return: the decoded value from C{inString}
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/protocols/amp.py