string in blob field causes db.export_from_csv_file to fail in python3

[mamisoa]

Hi,

If a blob field is populated with a string, db.export_from_csv_file fails in python 3:
File "/home/www-data/web2py/gluon/packages/dal/pydal/objects.py", line 2811, in export_to_csv_file
value = base64.b64encode(value)
TypeError(a bytes-like object is required, not 'str')

from https://groups.google.com/d/msg/web2py/QaRpnLnLy_k/gnzooKlkCQAJ

Mamisoa