Python method to call the MIXED procedure

        Documentation link:
        https://go.documentation.sas.com/?cdcId=pgmsascdc&cdcVersion=9.4_3.4&docsetId=statug&docsetTarget=statug_mixed_syntax.htm&locale=en

        :param data: SASdata object or string. This parameter is required.
        :parm by: The by variable can only be a string type.
        :parm cls: The cls variable can be a string or list type. It refers to the categorical, or nominal variables.
        :parm code: The code variable can only be a string type.
        :parm contrast: The contrast variable can only be a string type.
        :parm estimate: The estimate variable can only be a string type.
        :parm id: The id variable can only be a string type.
        :parm lsmeans: The lsmeans variable can only be a string type.
        :parm model: The model variable can only be a string type.
        :parm out: The out variable can be a string, boolean or SASdata type. The member name for a boolean is "_output".
        :parm random: The random variable can only be a string type.
        :parm repeated: The repeated variable can only be a string type.
        :parm slice: The slice variable can only be a string type.
        :parm weight: The weight variable can only be a string type.
        :parm procopts: The procopts variable is a generic option available for advanced use. It can only be a string type.
        :parm stmtpassthrough: The stmtpassthrough variable is a generic option available for advanced use. It can only be a string type.
        :return: SAS Result Object

def mixed(self, data: ['SASdata', str] = None,
              by: str = None,
              cls: [str, list] = None,
              code: str = None,
              contrast: str = None,
              estimate: str = None,
              id: str = None,
              lsmeans: str = None,
              model: str = None,
              out: [str, bool, 'SASdata'] = None,
              random: str = None,
              repeated: str = None,
              slice: str = None,
              weight: str = None,
              procopts: str = None,
              stmtpassthrough: str = None,
              **kwargs: dict) -> 'SASresults':
        """
        Python method to call the MIXED procedure

        Documentation link:
        https://go.documentation.sas.com/?cdcId=pgmsascdc&cdcVersion=9.4_3.4&docsetId=statug&docsetTarget=statug_mixed_syntax.htm&locale=en

        :param data: SASdata object or string. This parameter is required.
        :parm by: The by variable can only be a string type.
        :parm cls: The cls variable can be a string or list type. It refers to the categorical, or nominal variables.
        :parm code: The code variable can only be a string type.
        :parm contrast: The contrast variable can only be a string type.
        :parm estimate: The estimate variable can only be a string type.
        :parm id: The id variable can only be a string type.
        :parm lsmeans: The lsmeans variable can only be a string type.
        :parm model: The model variable can only be a string type.
        :parm out: The out variable can be a string, boolean or SASdata type. The member name for a boolean is "_output".
        :parm random: The random variable can only be a string type.
        :parm repeated: The repeated variable can only be a string type.
        :parm slice: The slice variable can only be a string type.
        :parm weight: The weight variable can only be a string type.
        :parm procopts: The procopts variable is a generic option available for advanced use. It can only be a string type.
        :parm stmtpassthrough: The stmtpassthrough variable is a generic option available for advanced use. It can only be a string type.
        :return: SAS Result Object

        """