Add a developer mode: -X dev command line option

[vstinner]

BPO	26670
Nosy	@ronaldoussoren, @vstinner
Files	dev_mode.patch

^{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 2016-04-01.14:08:18.840>
created_at = <Date 2016-03-30.08:20:14.736>
labels = ['type-feature']
title = 'Add a developer mode: -X dev command line option'
updated_at = <Date 2016-04-01.14:17:52.884>
user = 'https://github.com/vstinner'

bugs.python.org fields:

activity = <Date 2016-04-01.14:17:52.884>
actor = 'SilentGhost'
assignee = 'none'
closed = True
closed_date = <Date 2016-04-01.14:08:18.840>
closer = 'vstinner'
components = []
creation = <Date 2016-03-30.08:20:14.736>
creator = 'vstinner'
dependencies = []
files = ['42326']
hgrepos = []
issue_num = 26670
keywords = ['patch']
message_count = 3.0
messages = ['262655', '262659', '262742']
nosy_count = 2.0
nosy_names = ['ronaldoussoren', 'vstinner']
pr_nums = []
priority = 'normal'
resolution = 'rejected'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue26670'
versions = ['Python 3.6']

[vstinner]

Attached patch implements the idea proposed on the python-ideas mailing list:
https://mail.python.org/pipermail/python-ideas/2016-March/039314.html

The patch is a proof-of-concept. The code still contains FIXME.

[ronaldoussoren]

Why does this patch execv() the interpreter to set options? I'd expect it to be possible to get the same result by updating the argument parsing code in Py_Main.

[vstinner]

Why does this patch execv() the interpreter to set options? I'd expect it to be possible to get the same result by updating the argument parsing code in Py_Main.

It's to set PYTHONMALLOC env var which must be set before Py_Main() is called.

Since I got negative feedback on python-ideas, I close this issue and will investigate the documentation option.