[issue31839] datetime: add method to parse isoformat() output

[Martin Panter]

Change by Martin Panter :


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resolution:  -> duplicate
stage:  -> resolved
status: open -> closed
superseder:  -> datetime: add ability to parse RFC 3339 dates and times

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[issue31839] datetime: add method to parse isoformat() output

[Paul Ganssle]

Paul Ganssle  added the comment:

This is a duplicate of #15873 and #24954 and can be closed, as 
`fromisoformat()` was added in Python 3.7.

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nosy: +p-ganssle

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[issue31839] datetime: add method to parse isoformat() output

[SilentGhost]

Change by SilentGhost :


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nosy: +belopolsky
versions: +Python 3.7

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[issue31839] datetime: add method to parse isoformat() output

[Oren Tirosh]

New submission from Oren Tirosh :

The object types in the datetime module can produce a standard string 
representation (rfc3339, a subset of iso8601) but they do not provide a method 
to parse it.

Proposed method names: isoparse or fromisoformat.

In addition, a constructor call with a single string argument may also be 
supported. This would make the behavior of datetime/date/time more similar to 
other value types such as int, str or float and maintain the same invariant of 
x == type(x)(str(x))

Requirements: support lossless round-tripping of all valid datetime object 
values to str and back, with the exception of objects having a custom tzinfo 
(not None or an instance of datetime.timezone).

The _strptime format of '%Y-%m-%d %H:%M:S.%f%z' comes close, but fails to meet 
these requirements in the following ways:

1. %z matches +HHMM, not +HH:MM (addressed by issue 31800, currently discussed 
on datetime-sig)
2. %z does not match the empty string, indicating a naive datetime object 
(tzinfo=None)
3. .%f requires a fraction part, while isoformat drops it when the timestamp is 
an exact second (microsecond=0).

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messages: 304728
nosy: orent
priority: normal
severity: normal
status: open
title: datetime: add method to parse isoformat() output
type: enhancement

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