Perhaps because of DALRef?

>>> rows = db(db.purchase.id>0).select()
>>> for row in rows:
...     print row
...
<DALStorage {'product': 5, 'update_record': <function <lambda> at
0x02E85AF0>, '
buyer': 9, 'order_date': datetime.date(2009, 10, 10), 'id': 1,
'quantity': 1}>
<DALStorage {'product': 5, 'update_record': <function <lambda> at
0x02EFBBF0>, '
buyer': 10, 'order_date': datetime.date(2009, 10, 11), 'id': 2,
'quantity': 4}>

>>> f=open(r"c:\temp\test.txt",'w')
>>> rows.export_to_csv_file(f)
Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "c:\web2py\gluon\sql.py", line 3199, in export_to_csv_file
    row.append(none_exception(record[f]))
  File "c:\web2py\gluon\sql.py", line 3184, in none_exception
    return value.isoformat()[:19].replace('T', ' ')
TypeError: 'NoneType' object is not callable

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