pprint usage example rethought.
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Łukasz Langa
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@ -188,36 +188,105 @@ are converted to strings. The default implementation uses the internals of the
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.. _pprint-example:
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pprint Example
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--------------
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Example
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-------
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This example demonstrates several uses of the :func:`pprint` function and its parameters.
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To demonstrate several uses of the :func:`pprint` function and its parameters,
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let's fetch information about a package from PyPI::
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>>> import json
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>>> import pprint
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>>> tup = ('spam', ('eggs', ('lumberjack', ('knights', ('ni', ('dead',
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... ('parrot', ('fresh fruit',))))))))
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>>> stuff = ['a' * 10, tup, ['a' * 30, 'b' * 30], ['c' * 20, 'd' * 20]]
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>>> pprint.pprint(stuff)
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['aaaaaaaaaa',
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('spam',
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('eggs',
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('lumberjack',
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('knights', ('ni', ('dead', ('parrot', ('fresh fruit',)))))))),
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['aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa', 'bbbbbbbbbbbbbbbbbbbbbbbbbbbbbb'],
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['cccccccccccccccccccc', 'dddddddddddddddddddd']]
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>>> pprint.pprint(stuff, depth=3)
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['aaaaaaaaaa',
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('spam', ('eggs', (...))),
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['aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa', 'bbbbbbbbbbbbbbbbbbbbbbbbbbbbbb'],
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['cccccccccccccccccccc', 'dddddddddddddddddddd']]
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>>> pprint.pprint(stuff, width=60)
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['aaaaaaaaaa',
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('spam',
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('eggs',
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('lumberjack',
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('knights',
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('ni', ('dead', ('parrot', ('fresh fruit',)))))))),
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['aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa',
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'bbbbbbbbbbbbbbbbbbbbbbbbbbbbbb'],
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['cccccccccccccccccccc', 'dddddddddddddddddddd']]
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>>> from urllib.request import urlopen
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>>> with urlopen('http://pypi.python.org/pypi/configparser/json') as url:
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... http_info = url.info()
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... raw_data = url.read().decode(http_info.get_content_charset())
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>>> package_data = json.loads(raw_data)
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>>> result = {'headers': http_info.items(), 'body': package_data}
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In its basic form, :func:`pprint` shows the whole object::
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>>> pprint.pprint(result)
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{'body': {'info': {'_pypi_hidden': False,
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'_pypi_ordering': 12,
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'classifiers': ['Development Status :: 4 - Beta',
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'Intended Audience :: Developers',
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'License :: OSI Approved :: MIT License',
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'Natural Language :: English',
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'Operating System :: OS Independent',
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'Programming Language :: Python',
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'Programming Language :: Python :: 2',
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'Programming Language :: Python :: 2.6',
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'Programming Language :: Python :: 2.7',
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'Topic :: Software Development :: Libraries',
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'Topic :: Software Development :: Libraries :: Python Modules'],
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'download_url': 'UNKNOWN',
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'home_page': 'http://docs.python.org/py3k/library/configparser.html',
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'keywords': 'configparser ini parsing conf cfg configuration file',
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'license': 'MIT',
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'name': 'configparser',
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'package_url': 'http://pypi.python.org/pypi/configparser',
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'platform': 'any',
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'release_url': 'http://pypi.python.org/pypi/configparser/3.2.0r3',
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'requires_python': None,
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'stable_version': None,
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'summary': 'This library brings the updated configparser from Python 3.2+ to Python 2.6-2.7.',
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'version': '3.2.0r3'},
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'urls': [{'comment_text': '',
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'downloads': 47,
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'filename': 'configparser-3.2.0r3.tar.gz',
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'has_sig': False,
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'md5_digest': '8500fd87c61ac0de328fc996fce69b96',
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'packagetype': 'sdist',
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'python_version': 'source',
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'size': 32281,
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'upload_time': '2011-05-10T16:28:50',
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'url': 'http://pypi.python.org/packages/source/c/configparser/configparser-3.2.0r3.tar.gz'}]},
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'headers': [('Date', 'Sat, 14 May 2011 12:48:52 GMT'),
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('Server', 'Apache/2.2.16 (Debian)'),
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('Content-Disposition', 'inline'),
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('Connection', 'close'),
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('Transfer-Encoding', 'chunked'),
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('Content-Type', 'application/json; charset="UTF-8"')]}
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The result can be limited to a certain *depth* (ellipsis is used for deeper
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contents)::
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>>> pprint.pprint(result, depth=3)
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{'body': {'info': {'_pypi_hidden': False,
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'_pypi_ordering': 12,
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'classifiers': [...],
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'download_url': 'UNKNOWN',
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'home_page': 'http://docs.python.org/py3k/library/configparser.html',
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'keywords': 'configparser ini parsing conf cfg configuration file',
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'license': 'MIT',
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'name': 'configparser',
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'package_url': 'http://pypi.python.org/pypi/configparser',
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'platform': 'any',
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'release_url': 'http://pypi.python.org/pypi/configparser/3.2.0r3',
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'requires_python': None,
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'stable_version': None,
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'summary': 'This library brings the updated configparser from Python 3.2+ to Python 2.6-2.7.',
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'version': '3.2.0r3'},
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'urls': [{...}]},
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'headers': [('Date', 'Sat, 14 May 2011 12:48:52 GMT'),
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('Server', 'Apache/2.2.16 (Debian)'),
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('Content-Disposition', 'inline'),
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('Connection', 'close'),
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('Transfer-Encoding', 'chunked'),
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('Content-Type', 'application/json; charset="UTF-8"')]}
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Additionally, maximum *width* can be suggested. If a long object cannot be
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split, the specified width will be exceeded::
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>>> pprint.pprint(result['headers'], width=30)
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[('Date',
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'Sat, 14 May 2011 12:48:52 GMT'),
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('Server',
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'Apache/2.2.16 (Debian)'),
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('Content-Disposition',
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'inline'),
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('Connection', 'close'),
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('Transfer-Encoding',
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'chunked'),
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('Content-Type',
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'application/json; charset="UTF-8"')]
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