Question

https://stackoverflow.com/a/32474751/5089204。如果在运行pip时它们的依赖项可用，则会安装它们;否则没有。

事后，如何判断给定pip包的C扩展是在系统级还是在给定的virtualenv中？

虽然pymongo是我目前关注的问题，但如果存在任意包的方法，我会很高兴。

Answer 1

可能有一个更优雅的解决方案，但你可以先用pip找到你机器上文件的位置：

vagrant@devboxM:~$ pip show pymongo
---
Metadata-Version: 2.0
Name: pymongo
Version: 3.2.2
Summary: Python driver for MongoDB <http://www.mongodb.org>
Home-page: http://github.com/mongodb/mongo-python-driver
Author: Bernie Hackett
Author-email: bernie@mongodb.com
Installer: pip
License: Apache License, Version 2.0
Location: /opt/miniconda2/lib/python2.7/site-packages
Requires:
Classifiers:
....

然后，您可以转到指定的目录并查看是否有任何已编译的库：

vagrant@devboxM:~$ cd /opt/miniconda2/lib/python2.7/site-packages/pymongo
vagrant@devboxM:/opt/miniconda2/lib/python2.7/site-packages/pymongo$ ls
auth.py             database.py                   monitoring.pyc         response.py             ssl_context.pyc
auth.pyc            database.pyc                  monitor.py             response.pyc            ssl_match_hostname.py
bulk.py             errors.py                     monitor.pyc            results.py              ssl_match_hostname.pyc
bulk.pyc            errors.pyc                    monotonic.py           results.pyc             ssl_support.py
client_options.py   helpers.py                    monotonic.pyc          server_description.py   ssl_support.pyc
client_options.pyc  helpers.pyc                   network.py             server_description.pyc  thread_util.py
_cmessage.so        __init__.py                   network.pyc            server.py               thread_util.pyc
collection.py       __init__.pyc                  operations.py          server.pyc              topology_description.py
collection.pyc      ismaster.py                   operations.pyc         server_selectors.py     topology_description.pyc
command_cursor.py   ismaster.pyc                  periodic_executor.py   server_selectors.pyc    topology.py
command_cursor.pyc  message.py                    periodic_executor.pyc  server_type.py          topology.pyc
common.py           message.pyc                   pool.py                server_type.pyc         uri_parser.py
common.pyc          mongo_client.py               pool.pyc               settings.py             uri_parser.pyc
cursor_manager.py   mongo_client.pyc              read_concern.py        settings.pyc            write_concern.py
cursor_manager.pyc  mongo_replica_set_client.py   read_concern.pyc       son_manipulator.py      write_concern.pyc
cursor.py           mongo_replica_set_client.pyc  read_preferences.py    son_manipulator.pyc
cursor.pyc          monitoring.py                 read_preferences.pyc   ssl_context.py

如果您看到一个已编译的库 - 这是一个Linux框，所以在这种情况下它是_cmessage.so，但是不同的平台有不同的约定 - 那么它很可能至少再次编译一些的C扩展。

如何判断pip包是否使用C扩展构建？

1 个答案: