Updating Py_InspectFlag programmatically

[atsuoishimoto]

BPO	36164
Nosy	@atsuoishimoto
PRs	bpo-36164: add sys.setinspectflag() #12138

^{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 = None
created_at = <Date 2019-03-02.06:10:23.982>
labels = ['interpreter-core', 'type-bug']
title = 'Updating Py_InspectFlag programmatically'
updated_at = <Date 2019-03-02.06:19:38.296>
user = 'https://github.com/atsuoishimoto'

bugs.python.org fields:

activity = <Date 2019-03-02.06:19:38.296>
actor = 'python-dev'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Interpreter Core']
creation = <Date 2019-03-02.06:10:23.982>
creator = 'ishimoto'
dependencies = []
files = []
hgrepos = []
issue_num = 36164
keywords = ['patch']
message_count = 1.0
messages = ['336993']
nosy_count = 1.0
nosy_names = ['ishimoto']
pr_nums = ['12138']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue36164'
versions = []

[atsuoishimoto]

I sometime use a hack to start interactive console after running script.

.. code-block:: python

   import os

os.environ['PYTHONINSPECT'] = 'x'
print("Hello")

This hack works because PYTHONINSPECT is checked here <https://github.com/python/cpython/blob/master/Modules/main.c#L738>__ when exiting Python.

However, if the script uses sys.exit() to exit from Python, interactive console doen't apper because unhandled SystemExit exception leads exit() call to kill process, without checking PYTHONINSPECT.

.. code-block:: python

   import os, sys

os.environ['PYTHONINSPECT'] = 'x'
print("Hello")

   sys.exit(1)  # Interactive console will not start

I think feature to allow updating Py_InspectFlag is useful, and this is a bugs to be fixed. However, setting environment variable to start console is not intuituve.

So instead of fixing bug, I would like to propose a small function to set Py_InspectFlag to start interactive console after running script.

.. code-block:: python

    sys.setinteractiveflag(bool)

Thoughts?