python：pprint实例

为了演示 pprint() 函数及其形参的几种用法，让我们从 PyPI 获取关于某个项目的信息:

>>>
import json
import pprint
from urllib.request import urlopen
with urlopen('https://pypi.org/pypi/sampleproject/json') as resp:project_info = json.load(resp)['info']

pprint() 以其基本形式显示了整个对象:

>>>
pprint.pprint(project_info)
{'author': 'The Python Packaging Authority','author_email': 'pypa-dev@googlegroups.com','bugtrack_url': None,'classifiers': ['Development Status :: 3 - Alpha','Intended Audience :: Developers','License :: OSI Approved :: MIT License','Programming Language :: Python :: 2','Programming Language :: Python :: 2.6','Programming Language :: Python :: 2.7','Programming Language :: Python :: 3','Programming Language :: Python :: 3.2','Programming Language :: Python :: 3.3','Programming Language :: Python :: 3.4','Topic :: Software Development :: Build Tools'],'description': 'A sample Python project\n''=======================\n''\n''This is the description file for the project.\n''\n''The file should use UTF-8 encoding and be written using ''ReStructured Text. It\n''will be used to generate the project webpage on PyPI, and ''should be written for\n''that purpose.\n''\n''Typical contents for this file would include an overview of ''the project, basic\n''usage examples, etc. Generally, including the project ''changelog in here is not\n''a good idea, although a simple "What\'s New" section for the ''most recent version\n''may be appropriate.','description_content_type': None,'docs_url': None,'download_url': 'UNKNOWN','downloads': {'last_day': -1, 'last_month': -1, 'last_week': -1},'home_page': 'https://github.com/pypa/sampleproject','keywords': 'sample setuptools development','license': 'MIT','maintainer': None,'maintainer_email': None,'name': 'sampleproject','package_url': 'https://pypi.org/project/sampleproject/','platform': 'UNKNOWN','project_url': 'https://pypi.org/project/sampleproject/','project_urls': {'Download': 'UNKNOWN','Homepage': 'https://github.com/pypa/sampleproject'},'release_url': 'https://pypi.org/project/sampleproject/1.2.0/','requires_dist': None,'requires_python': None,'summary': 'A sample Python project','version': '1.2.0'}

结果可以被限制到特定的 depth (更深层的内容将使用省略号):

>>>
pprint.pprint(project_info, depth=1)
{'author': 'The Python Packaging Authority','author_email': 'pypa-dev@googlegroups.com','bugtrack_url': None,'classifiers': [...],'description': 'A sample Python project\n''=======================\n''\n''This is the description file for the project.\n''\n''The file should use UTF-8 encoding and be written using ''ReStructured Text. It\n''will be used to generate the project webpage on PyPI, and ''should be written for\n''that purpose.\n''\n''Typical contents for this file would include an overview of ''the project, basic\n''usage examples, etc. Generally, including the project ''changelog in here is not\n''a good idea, although a simple "What\'s New" section for the ''most recent version\n''may be appropriate.','description_content_type': None,'docs_url': None,'download_url': 'UNKNOWN','downloads': {...},'home_page': 'https://github.com/pypa/sampleproject','keywords': 'sample setuptools development','license': 'MIT','maintainer': None,'maintainer_email': None,'name': 'sampleproject','package_url': 'https://pypi.org/project/sampleproject/','platform': 'UNKNOWN','project_url': 'https://pypi.org/project/sampleproject/','project_urls': {...},'release_url': 'https://pypi.org/project/sampleproject/1.2.0/','requires_dist': None,'requires_python': None,'summary': 'A sample Python project','version': '1.2.0'}

此外，还可以设置建议的最大字符 width。如果一个对象无法被拆分，则将超出指定宽度:

>>>
pprint.pprint(project_info, depth=1, width=60)
{'author': 'The Python Packaging Authority','author_email': 'pypa-dev@googlegroups.com','bugtrack_url': None,'classifiers': [...],'description': 'A sample Python project\n''=======================\n''\n''This is the description file for the ''project.\n''\n''The file should use UTF-8 encoding and be ''written using ReStructured Text. It\n''will be used to generate the project ''webpage on PyPI, and should be written ''for\n''that purpose.\n''\n''Typical contents for this file would ''include an overview of the project, ''basic\n''usage examples, etc. Generally, including ''the project changelog in here is not\n''a good idea, although a simple "What\'s ''New" section for the most recent version\n''may be appropriate.','description_content_type': None,'docs_url': None,'download_url': 'UNKNOWN','downloads': {...},'home_page': 'https://github.com/pypa/sampleproject','keywords': 'sample setuptools development','license': 'MIT','maintainer': None,'maintainer_email': None,'name': 'sampleproject','package_url': 'https://pypi.org/project/sampleproject/','platform': 'UNKNOWN','project_url': 'https://pypi.org/project/sampleproject/','project_urls': {...},'release_url': 'https://pypi.org/project/sampleproject/1.2.0/','requires_dist': None,'requires_python': None,'summary': 'A sample Python project','version': '1.2.0'}

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python：pprint实例

python：pprint实例

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