pprint could use line continuation for long string literals

[pitrou]

BPO	17150
Nosy	@freddrake, @rhettinger, @pitrou
Files	str_pprint.patch str_pprint2.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 2013-03-23.19:37:04.171>
created_at = <Date 2013-02-07.12:51:07.541>
labels = ['type-feature', 'library']
title = 'pprint could use line continuation for long string literals'
updated_at = <Date 2013-03-24.15:55:00.642>
user = 'https://github.com/pitrou'

bugs.python.org fields:

activity = <Date 2013-03-24.15:55:00.642>
actor = 'rhettinger'
assignee = 'none'
closed = True
closed_date = <Date 2013-03-23.19:37:04.171>
closer = 'pitrou'
components = ['Library (Lib)']
creation = <Date 2013-02-07.12:51:07.541>
creator = 'pitrou'
dependencies = []
files = ['29492', '29515']
hgrepos = []
issue_num = 17150
keywords = ['patch']
message_count = 8.0
messages = ['181599', '181605', '181643', '184695', '184808', '185076', '185077', '185141']
nosy_count = 4.0
nosy_names = ['fdrake', 'rhettinger', 'pitrou', 'python-dev']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue17150'
versions = ['Python 3.4']

[pitrou]

Currently:

>>> pprint.pprint({"a": "xxx " * 50})
{'a': 'xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx '}

It would be nicer if it produced something like:

>>> pprint.pprint({"a": "xxx " * 50})
{'a': 'xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx '
      'xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx '
      'xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx '
      'xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx '
      'xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx '}

(for the record, the real-world use case I encountered was when printing some pyudev data)

[freddrake]

I like this.

It would be especially nice if it were smart enough to split the segments after sequences of line-ends (r'(\r?\n)+').

[pitrou]

I was thinking we could re-use textwrap, actually.

[pitrou]

Here is a patch.

[pitrou]

Here is a new patch with more tests and updated docs.

[python-dev]

New changeset 5a2296093645 by Antoine Pitrou in branch 'default':
Issue bpo-17150: pprint now uses line continuations to wrap long string literals.
http://hg.python.org/cpython/rev/5a2296093645

[pitrou]

Ok, I've committed the patch.

[rhettinger]

This is a nice addition. Thank you.