replaces the code for value in a new _value field

swap_code_for_value.py

def replace_codes_with_values(feature_class, field_info, domain_info):
    field_domain_map = [(field, field.domain) for field in field_info if field.domain]
    fields = [field[0] for field in field_domain_map]
    field_names = [field.name for field in fields]
    domain_names = [domain[1] for domain in field_domain_map]

    domain_lookup = {}
    for name in domain_names:
        domain_lookup[name] = [domain for domain in domain_info if domain.name == name][0]

    [arcpy.management.RemoveDomainFromField(feature_class, field.name) for field in fields]
    [arcpy.management.AddField(feature_class, '{}_Value'.format(field.name), 'TEXT', field_alias=field.aliasName) for field in fields]

    def swap_code_for_value(code, domain_name):
        domain = domain_lookup[domain_name].codedValues
        if not domain:
            return code

        if code not in domain:
            return code

        return domain[code]

    combined_fields = field_names + ['{}_Value'.format(field) for field in field_names]

    with arcpy.da.UpdateCursor(feature_class, combined_fields) as cursor:
        for row in cursor:
            values_row = [swap_code_for_value(code, domain_names[i]) for i, code in enumerate(row) if i < len(field_names)]
            row = row[:len(field_names)] + values_row

            cursor.updateRow(row)

    arcpy.management.DeleteField(feature_class, field_names)