Why token is invalid after iteration ?

[JBPressac]

Hello, On Python 3.5.2 + Sickle 0.5, if we display the token after an iteration on a ListRecords, we get an AttributeError. Do you have any explanation about that ?

from sickle import Sickle

cm_sickle = Sickle('http://oai.openedition.org' )
records_original = cm_sickle.ListRecords(set='journals:cm', metadataPrefix='mets')
print(records_original.resumption_token.token) 
# Prints correctly the token

for record in records_original:
    print(record.raw)

print(records_original.resumption_token.token) 
# Error AttributeError: 'NoneType' object has no attribute 'token'

Thanks,

[mloesch]

When iterating over records, Sickle automatically handles the paging with resumption tokens for you. Therefore the following part of your code already iterates over all records found by the ListRecords query, not just the first page.

for record in records_original:
    print(record.raw)

Because there is no resumption token on the last page, the resumption_token property will be empty after the iteration.