storage location, defaults to ds.default.location folder
extension
file extension, defaults to 'csv'
date.format
date format, defaults to "%Y-%m-%d"
use "%Y-%m-%d %H:%M:%S" for storing intra day data
custom.folder
custom folder flag, defaults to False
if flag is False default, the data is stored at the "location\src_extnsion" folder.
if flag is True, the data is stored at the location folder.