Replace 'default' with 'main' as default in sys.version

[ezio-melotti]

BPO	45532
Nosy	@ezio-melotti, @corona10, @miss-islington, @youknowone
PRs	bpo-45532: Replace 'default' with 'main' as default in sys.version #29100 [3.10] bpo-45532: Replace 'default' with 'main' as default in sys.version (GH-29100) #29106 [3.9] bpo-45532: Replace 'default' with 'main' as default in sys.version (GH-29100) #29107

^{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 2021-10-20.17:55:32.446>
created_at = <Date 2021-10-19.23:40:13.821>
labels = ['interpreter-core', 'easy', 'type-bug', '3.9', '3.10', '3.11']
title = "Replace 'default' with 'main' as default in sys.version"
updated_at = <Date 2021-10-20.17:55:32.445>
user = 'https://github.com/ezio-melotti'

bugs.python.org fields:

activity = <Date 2021-10-20.17:55:32.445>
actor = 'corona10'
assignee = 'none'
closed = True
closed_date = <Date 2021-10-20.17:55:32.446>
closer = 'corona10'
components = ['Interpreter Core']
creation = <Date 2021-10-19.23:40:13.821>
creator = 'ezio.melotti'
dependencies = []
files = []
hgrepos = []
issue_num = 45532
keywords = ['patch', 'easy (C)']
message_count = 9.0
messages = ['404380', '404383', '404384', '404410', '404412', '404499', '404504', '404505', '404506']
nosy_count = 4.0
nosy_names = ['ezio.melotti', 'corona10', 'miss-islington', 'youknowone']
pr_nums = ['29100', '29106', '29107']
priority = 'normal'
resolution = None
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue45532'
versions = ['Python 3.9', 'Python 3.10', 'Python 3.11']

[ezio-melotti]

sys.version returns '3.10.0 (default, Oct 5 2021, 23:49:26) [GCC 10.2.1 20210110]'

'default' is supposed to represent the name of the branch, and it's been there since the HG days:

cpython/Modules/getbuildinfo.c

Line 44 in fc64c35

hgid = "default";

When the code was updated for Git in bpo-27593, the default remained the same:

cpython/Modules/getbuildinfo.c

Line 44 in bb3e0c2

gitid = "default";

The default should be updated to 'main'.

Note that _Py_gitidentifier is supposed to return meaningful values while building from within a git checkout -- when it fails to do so the default value is used. This can also be tested through sys._git (which returns ('CPython', '', '')), but at the moment I can't build from a git checkout and verify that _Py_gitidentifier returns the correct branch. If not, a separate issue should be created.

[corona10]

+1

[corona10]

youknowone

Do you want to take a look?