pyw.exe opens console window in Windows 10

[AndrewUshakov]

BPO	38359
Nosy	@pfmoore, @tjguk, @ambv, @zware, @zooba, @miss-islington, @Harmon758
PRs	bpo-38359: Ensures pyw.exe launcher reads correct registry key #16561 [3.8] bpo-38359: Ensures pyw.exe launcher reads correct registry key (GH-16561) #16564

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/zooba'
closed_at = <Date 2019-10-14.21:45:39.035>
created_at = <Date 2019-10-03.09:53:25.492>
labels = ['type-bug', '3.8', '3.9', 'OS-windows', 'release-blocker']
title = 'pyw.exe opens console window in Windows 10'
updated_at = <Date 2019-10-14.21:45:39.034>
user = 'https://bugs.python.org/AndrewUshakov'

bugs.python.org fields:

activity = <Date 2019-10-14.21:45:39.034>
actor = 'lukasz.langa'
assignee = 'steve.dower'
closed = True
closed_date = <Date 2019-10-14.21:45:39.035>
closer = 'lukasz.langa'
components = ['Windows']
creation = <Date 2019-10-03.09:53:25.492>
creator = 'Andrew Ushakov'
dependencies = []
files = []
hgrepos = []
issue_num = 38359
keywords = ['patch', '3.8regression']
message_count = 6.0
messages = ['353836', '353852', '353856', '353862', '353864', '354666']
nosy_count = 8.0
nosy_names = ['paul.moore', 'tim.golden', 'lukasz.langa', 'zach.ware', 'steve.dower', 'miss-islington', 'Harmon758', 'Andrew Ushakov']
pr_nums = ['16561', '16564']
priority = 'release blocker'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue38359'
versions = ['Python 3.8', 'Python 3.9']

[AndrewUshakov]

pyw.exe (Python Launcher for Windows Version 3.8.121.1013) opens a console window at startup. To reproduce, run command below from the console:

D:>pyw -c "import time; time.sleep(10)"

By the way command:

D:>pythomw -c "import time; time.sleep(10)"

works as expected, silently.

[zooba]

I know what this is - in bpo-38133 I added support for the PEP-514 ExecutablePath key, but didn't add a check for WindowedExecutablePath for the pyw.exe case.

I'll add it.

[zooba]

New changeset 353fb1e by Steve Dower in branch 'master':
bpo-38359: Ensures pyw.exe launcher reads correct registry key (GH-16561)
353fb1e

[miss-islington]

New changeset e74fa70 by Miss Islington (bot) in branch '3.8':
bpo-38359: Ensures pyw.exe launcher reads correct registry key (GH-16561)
e74fa70

[zooba]

This is resolved as far as I'm concerned - leaving open for Łukasz to cherrypick and close.

[ambv]

(3.8.0 is released with this fix)