How to use the ecl.util.util.StringList function in ecl

def keys(self, pattern=None):
        """
        Return a StringList of summary keys matching @pattern.

        The matching algorithm is ultimately based on the fnmatch()
        function, i.e. normal shell-character syntax is used. With
        @pattern == "WWCT:*" you will get a list of watercut keys for
        all wells.

        If pattern is None you will get all the keys of summary
        object.
        """
        s = StringList()
        self._select_matching_keys(pattern, s)
        return s

By default all the vectors in the summary case will be
        exported, but by using the optional keys parameter you can
        limit the keys which are exported:

          ecl_sum = EclSum("CASE")
          ecl_sum.exportCSV("case.csv", keys=["W*:OP1", "W*:OP2", "F*T"])

        Will export all well related variables for wells 'OP1' and
        'OP2' and all total field vectors.
        """

        if keys is None:
            var_list = self.keys()
        else:
            var_list = StringList()
            for key in keys:
                var_list |= self.keys(pattern=key)
        self._export_csv(filename, var_list, date_format, sep)

def keys(self, pattern=None):
        """
        Return a StringList of summary keys matching @pattern.

        The matching algorithm is ultimately based on the fnmatch()
        function, i.e. normal shell-character syntax is used. With
        @pattern == "WWCT:*" you will get a list of watercut keys for
        all wells.

        If pattern is None you will get all the keys of summary
        object.
        """
        s = StringList()
        self._select_matching_keys(pattern, s)
        return s

By default all the vectors in the summary case will be
        exported, but by using the optional keys parameter you can
        limit the keys which are exported:

          ecl_sum = EclSum("CASE")
          ecl_sum.exportCSV("case.csv", keys=["W*:OP1", "W*:OP2", "F*T"])

        Will export all well related variables for wells 'OP1' and
        'OP2' and all total field vectors.
        """

        if keys is None:
            var_list = self.keys()
        else:
            var_list = StringList()
            for key in keys:
                var_list |= self.keys(pattern=key)
        self._export_csv(filename, var_list, date_format, sep)

def load(cls, smspec_file, unsmry_file, key_join_string = ":", include_restart = True):
        if not os.path.isfile( smspec_file ):
            raise IOError("No such file: %s" % smspec_file)

        if not os.path.isfile( unsmry_file ):
            raise IOError("No such file: %s" % unsmry_file )

        data_files = StringList( )
        data_files.append( unsmry_file )
        c_ptr = cls._fread_alloc(smspec_file, data_files, key_join_string, include_restart)
        if c_ptr is None:
            raise IOError("Failed to create summary instance")

        ecl_sum = cls.createPythonObject( c_ptr )
        ecl_sum._load_case = smspec_file
        return ecl_sum