Give pdb.set_trace() an optional `header` keyword argument

[warsaw]

BPO	31389
Nosy	@warsaw
PRs	bpo-31389 Add an optional header argument to pdb.set_trace() #3438

^{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 = 'https://github.com/warsaw'
closed_at = <Date 2017-09-22.16:30:06.920>
created_at = <Date 2017-09-07.22:30:47.069>
labels = ['3.7', 'library']
title = 'Give pdb.set_trace() an optional `header` keyword argument'
updated_at = <Date 2017-09-22.16:30:06.919>
user = 'https://github.com/warsaw'

bugs.python.org fields:

activity = <Date 2017-09-22.16:30:06.919>
actor = 'barry'
assignee = 'barry'
closed = True
closed_date = <Date 2017-09-22.16:30:06.920>
closer = 'barry'
components = ['Library (Lib)']
creation = <Date 2017-09-07.22:30:47.069>
creator = 'barry'
dependencies = []
files = []
hgrepos = []
issue_num = 31389
keywords = ['patch']
message_count = 3.0
messages = ['301643', '301646', '302754']
nosy_count = 1.0
nosy_names = ['barry']
pr_nums = ['3438']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue31389'
versions = ['Python 3.7']

[warsaw]

IPython has a neat little feature where the function that enters the debugger takes an optional header argument. If given, it is a string that's printed to the console just before the debugger is entered.

https://github.com/ipython/ipython/blob/master/IPython/terminal/embed.py#L177
https://mail.python.org/pipermail/python-dev/2017-September/149256.html

I kind of realized this would be nice to have in pdb, and the code is easy so here's the tracking issue.

[warsaw]

And specifically header is chosen to match IPython. Why be different?

[warsaw]

New changeset 35425d6 by Barry Warsaw in branch 'master':
bpo-31389 Add an optional header argument to pdb.set_trace() (bpo-3438)
35425d6