Remove global configuration variable Py_UseClassExceptionsFlag

[vstinner]

BPO	32125
Nosy	@vstinner
PRs	bpo-32125: Remove Py_UseClassExceptionsFlag flag #4544

^{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 2017-11-24.21:37:21.751>
created_at = <Date 2017-11-24.15:20:05.699>
labels = ['interpreter-core', '3.7']
title = 'Remove global configuration variable Py_UseClassExceptionsFlag'
updated_at = <Date 2017-11-24.21:37:21.750>
user = 'https://github.com/vstinner'

bugs.python.org fields:

activity = <Date 2017-11-24.21:37:21.750>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2017-11-24.21:37:21.751>
closer = 'vstinner'
components = ['Interpreter Core']
creation = <Date 2017-11-24.15:20:05.699>
creator = 'vstinner'
dependencies = []
files = []
hgrepos = []
issue_num = 32125
keywords = ['patch']
message_count = 2.0
messages = ['306900', '306918']
nosy_count = 1.0
nosy_names = ['vstinner']
pr_nums = ['4544']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue32125'
versions = ['Python 3.7']

[vstinner]

The Py_UseClassExceptionsFlag flag was added by the commit 035574d.

The commit 757af0e started to use this flag:

+ /* if Python was started with -X, initialize the class exceptions */
+ if (Py_UseClassExceptionsFlag)
+ init_class_exc(dict);

Later followed by commit 98b6246.

The flag was finally deprecated in the commit 3ce0964 in 2000.

All these changes are older than Python 2.0.

In Python 2.7 and 3.6, the flag is not used at all.

I think that it's time to remove it :-)

[vstinner]

New changeset da9c8c3 by Victor Stinner in branch 'master':
bpo-32125: Remove Py_UseClassExceptionsFlag flag (bpo-4544)
da9c8c3