PythonLauncher app fails run scripts on Mac BigSur

[gnvirgutto1990]

BPO	45685
Nosy	@ronaldoussoren, @ned-deily
Superseder	bpo-40477: Python Launcher app on macOS 10.15+ fails to run scripts

^{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 = None
closed_at = <Date 2021-11-02.01:52:55.630>
created_at = <Date 2021-11-01.23:09:34.125>
labels = ['OS-mac', 'type-bug', '3.9', '3.10', '3.11']
title = 'PythonLauncher app fails run scripts on Mac BigSur'
updated_at = <Date 2021-11-02.01:52:55.629>
user = 'https://bugs.python.org/gnvirgutto1990'

bugs.python.org fields:

activity = <Date 2021-11-02.01:52:55.629>
actor = 'ned.deily'
assignee = 'none'
closed = True
closed_date = <Date 2021-11-02.01:52:55.630>
closer = 'ned.deily'
components = ['macOS']
creation = <Date 2021-11-01.23:09:34.125>
creator = 'gnvirgutto1990'
dependencies = []
files = []
hgrepos = []
issue_num = 45685
keywords = []
message_count = 2.0
messages = ['405475', '405477']
nosy_count = 3.0
nosy_names = ['ronaldoussoren', 'ned.deily', 'gnvirgutto1990']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = 'resolved'
status = 'closed'
superseder = '40477'
type = 'behavior'
url = 'https://bugs.python.org/issue45685'
versions = ['Python 3.9', 'Python 3.10', 'Python 3.11']

[gnvirgutto1990]

I can’t figure out how to use Python Launcher on BigSur. Or it is broken. Anyway: It does absolutely nothing. When I double click a script file, I see very shortly the preferences window of Launcher, and this is all. The script is not executed. I made a very simple script which writes a small text file. The script works flawlessly, when I call it in the terminal, but the Launcher seems not even to open it.

Is this a bug with BigSur, or what is to be done?

[ned-deily]

Thank you for the issue and the reminder. Unfortunately, you are running into a problem with the Python Launcher as documented in open bpo-40477, a problem that has slipped off my radar. Due to changes in macOS 10.15 Catalina and still present in 11 Big Sur, the Python Launcher is no longer able to successfully launch the Terminal app so the scripts are never executed. As described in msg368819 there, there is a simple workaround: just ensure that the Terminal app is already launched before trying to use the Python Launcher.