Implement packaging.database.*Distribution.__str__

[merwok]

BPO	13166
Nosy	@tarekziade, @merwok

^{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/merwok'
closed_at = <Date 2014-03-13.00:42:16.626>
created_at = <Date 2011-10-13.15:52:10.839>
labels = []
title = 'Implement packaging.database.*Distribution.__str__'
updated_at = <Date 2014-03-13.00:42:16.626>
user = 'https://github.com/merwok'

bugs.python.org fields:

activity = <Date 2014-03-13.00:42:16.626>
actor = 'eric.araujo'
assignee = 'eric.araujo'
closed = True
closed_date = <Date 2014-03-13.00:42:16.626>
closer = 'eric.araujo'
components = ['Distutils2']
creation = <Date 2011-10-13.15:52:10.839>
creator = 'eric.araujo'
dependencies = []
files = []
hgrepos = []
issue_num = 13166
keywords = []
message_count = 3.0
messages = ['145463', '160800', '160896']
nosy_count = 4.0
nosy_names = ['tarek', 'eric.araujo', 'alexis', 'python-dev']
pr_nums = []
priority = 'normal'
resolution = 'out of date'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue13166'
versions = ['3rd party', 'Python 3.3']

[merwok]

In code working with instances of packaging.database.Distribution, it’s bothersome to have to use '%r %s' % (dist.name, dist.version) all the time. It is also not good-looking in 2.x, where we get u'name'. I think it would be best to implement a __str__ method on the class and just use %s everywhere, for example in pysetup list and pysetup search. More sophisticated clients that want to display projects in a GUI can still access dist.name, dist.version and other attributes.

I’ve insisted on using %r for project names and paths to avoid ambiguities with trailing spaces and such hard-to-catch things. For logging output, we have to pass pure strings, but for direct console printing we could use ANSI escape sequences to display projects’ names in bold for example.

[python-dev]

New changeset ff44594dd3c0 by Guillaume Pratte in branch 'default':
bpo-13166: Implement __str__ on Distribution and EggInfoDistribution, use for pysetup list, pysetup graph and installation log
http://hg.python.org/distutils2/rev/ff44594dd3c0

[merwok]

64b0bf5e0596 reverted the changes to d2.depgraph; more tests need to be added first to make sure the new output is still valid DOT.