How to use the ecl.EclDataType function in ecl

def shift_kw( self , ecl_kw , shift , force_active = False):
        """
        See usage documentation on iadd_kw().
        """
        self.scalar_apply_kw( ecl_kw , shift , {EclDataType.ECL_INT    : self._shift_kw_int,
                                                EclDataType.ECL_FLOAT  : self._shift_kw_float ,
                                                EclDataType.ECL_DOUBLE : self._shift_kw_double} , force_active)

[1]: It is possible, but not recommended, to pass in None for
        @kw, in which case the method will load the first keyword
        it finds in the file.
        """

        cfile  = CFILE(fileH)
        if kw:
            if len(kw) > 8:
                raise TypeError("Sorry keyword:%s is too long, must be eight characters or less." % kw)

        if ecl_type is None:
            if cls.int_kw_set.__contains__(kw):
                ecl_type = EclDataType.ECL_INT
            else:
                ecl_type = EclDataType.ECL_FLOAT

        ecl_type = warn_and_cast_data_type(ecl_type)

        if not isinstance(ecl_type, EclDataType):
            raise TypeError("Expected EclDataType, was: %s" % type(ecl_type))

        if not ecl_type in [EclDataType.ECL_FLOAT, EclDataType.ECL_INT]:
            raise ValueError("The type:%s is invalid when loading keyword:%s" % (ecl_type.type_name, kw))

        return cls._load_grdecl(cfile, kw, strict, ecl_type)

def warn_and_cast_data_type(data_type):
    if isinstance(data_type, EclDataType):
        return data_type
    if isinstance(data_type, EclTypeEnum):
        if not constant_size_data_type(data_type):
            raise ValueError("Cannot cast EclTypeEnum (%d) to EclDataType due "
                    "to non-constant size. Please provide an EclDataType instead.")

        dump_type_deprecation_warning()
        return EclDataType(data_type)

def warn_and_cast_data_type(data_type):
    if isinstance(data_type, EclDataType):
        return data_type
    if isinstance(data_type, EclTypeEnum):
        if not constant_size_data_type(data_type):
            raise ValueError("Cannot cast EclTypeEnum (%d) to EclDataType due "
                    "to non-constant size. Please provide an EclDataType instead.")

        dump_type_deprecation_warning()
        return EclDataType(data_type)