Raymond Hettinger <raymond.hettin...@gmail.com> added the comment:
Except for display the last few elements, this is the documented and intended
behavior: ( https://docs.python.org/3/library/itertools.html#itertools.groupby
):
'''
The returned group is itself an iterator that shares the underlying iterable
with groupby(). Because the source is shared, when the groupby() object is
advanced, the previous group is no longer visible. So, if that data is needed
later, it should be stored as a list:
groups = []
uniquekeys = []
data = sorted(data, key=keyfunc)
for k, g in groupby(data, keyfunc):
groups.append(list(g)) # Store group iterator as a list
uniquekeys.append(k)
'''
The display of the last few elements isn't supposed to happen. That is being
fixed so that all of the subiterator results are empty when the parent iterator
is exhausted.
----------
assignee: -> rhettinger
nosy: +rhettinger
resolution: -> not a bug
stage: -> resolved
status: open -> closed
_______________________________________
Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue31614>
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