问(或设置工具、分发等)列出每个安装的软件包使用的许可证？

EN

$ pip show django -v | grep -i license
License: BSD
  License :: OSI Approved :: BSD License

$ pip show setuptools -v | grep -i license
License: UNKNOWN
  License :: OSI Approved :: MIT License

$ pip show python-dateutil -v | grep -i license
License: Dual License
  License :: OSI Approved :: BSD License
  License :: OSI Approved :: Apache Software License

$ pip show ipdb -v | grep -i license
License: BSD

from itertools import chain, compress
from pkg_resources import get_distribution


def filters(line):
    return compress(
        (line[9:], line[39:]),
        (line.startswith('License:'), line.startswith('Classifier: License')),
    )


def get_pkg_license(pkg):
    distribution = get_distribution(pkg)
    try:
        lines = distribution.get_metadata_lines('METADATA')
    except OSError:
        lines = distribution.get_metadata_lines('PKG-INFO')
    return tuple(chain.from_iterable(map(filters, lines)))

>>> tuple(get_pkg_license(get_distribution('django')))
('BSD', 'BSD License')

>>> tuple(get_pkg_license(get_distribution('setuptools')))
('UNKNOWN', 'MIT License')

>>> tuple(get_pkg_license(get_distribution('python-dateutil')))
('Dual License', 'BSD License', 'Apache Software License')

>>> tuple(get_pkg_license(get_distribution('ipdb')))
('BSD',)

>>> {
        p.project_name: get_pkg_license(p) 
        for p in pkg_resources.working_set
    }