New submission from Jaap van der Velde <jaapvanderve...@gmail.com>:

When running:
```
datetime.strptime('2013 23', '%Y %W')
```
The result is `datetime.datetime(2013, 1, 1, 0, 0)`. When running:
```
datetime.strptime('2013 23 1', '%Y %W %w')
```
The result is `datetime.datetime(2013, 6, 10, 0, 0)`.

It seems that `%W` is ignored, unless `%w` is also provided. But instead of 
throwing an error, a result is returned that is needlessly inaccurate. It could 
(and should?) return the first day of the week as a default, if an error is 
undesirable. Similar to:
```
datetime.strptime('2013 3', '%Y %m')
```

----------
components: Library (Lib)
messages: 394611
nosy: Jaap van der Velde
priority: normal
severity: normal
status: open
title: strptime and week numbers without week days
type: enhancement
versions: Python 3.9

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue44255>
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