pyexcel v0.4.3 Release Notes
. '.stream' attribute are attached to
get direct access the underneath stream in responding to file type attributes, such as sheet.xls. it helps provide a custom stream to external world, for example, Sheet.stream.csv gives a text stream that contains csv formatted data. Book.stream.xls returns a xls format data in a byte stream.
👍 #. Better error reporting when an unknown parameters or unsupported file types were given to the signature functions.