If path is an URL, it will be downloaded, stored in the DataSource
directory and opened from there.
Parameters :
path : str
Local file path or URL to open.
mode : {‘r’, ‘w’, ‘a’}, optional
Mode to open path. Mode ‘r’ for reading, ‘w’ for writing, ‘a’ to
append. Available modes depend on the type of object specified by
path. Default is ‘r’.