[issue40076] isoformat function drops microseconds part if its value is 000000

[Alexander Bolshakov]

New submission from Alexander Bolshakov <lextiz at gmail.com>:

isoformat function does not conform to the ISO 8601 and drops microseconds part if its value is 000000.

The issue can be reproduced using the following code snippet:

for i in range(1,10000000):
     timestamp=datetime.datetime.utcnow().isoformat()
     if len(timestamp)!=26:
         print(timestamp)

----------
components: Library (Lib)
messages: 365077
nosy: Alexander Bolshakov
priority: normal
severity: normal
status: open
title: isoformat function drops microseconds part if its value is 000000
type: behavior
versions: Python 2.7, Python 3.5, Python 3.6, Python 3.7, Python 3.8, Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40076>
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