New submission from Michał Kozik <mike.koi...@gmail.com>:
Tuples (datetime, description) all are sorted by the date except one entry
(2021-03-09) which is out of order:
Expected order: Actual order:
2021-03-04 Event E 2021-03-04 Event E
2021-03-07 Event B 2021-03-07 Event B
2021-03-08 Event C 2021-03-08 Event C
2021-03-09 Event A 2021-03-11 Event D
2021-03-11 Event D 2021-03-09 Event A
In REPL it can be replicated by pasting the following code:
import heapq
from datetime import datetime
event_a = (datetime.strptime('2021-03-09', '%Y-%m-%d'), "Event A")
event_b = (datetime.strptime('2021-03-07', '%Y-%m-%d'), "Event B")
event_c = (datetime.strptime('2021-03-08', '%Y-%m-%d'), "Event C")
event_d = (datetime.strptime('2021-03-11', '%Y-%m-%d'), "Event D")
event_e = (datetime.strptime('2021-03-04', '%Y-%m-%d'), "Event E")
events = []
heapq.heappush(events, event_a)
heapq.heappush(events, event_b)
heapq.heappush(events, event_c)
heapq.heappush(events, event_d)
heapq.heappush(events, event_e)
expected_list = [event_e, event_b, event_c, event_a, event_d]
assert events == expected_list
----------
components: Library (Lib)
files: test_heapq.py
messages: 388012
nosy: mike.koikos
priority: normal
severity: normal
status: open
title: heapq fails to sort tuples by datetime correctly
type: behavior
versions: Python 3.8, Python 3.9
Added file: https://bugs.python.org/file49848/test_heapq.py
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue43385>
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