如何理解python配置文件中的`::`？

Question

From the github address:

https://github.com/openstack/nova/blob/master/setup.cfg

In the setup.cfg , there is code below:

[metadata]
name = nova
summary = Cloud computing fabric controller
description-file =
    README.rst
author = OpenStack
author-email = openstack-dev@lists.openstack.org
home-page = http://docs.openstack.org/developer/nova/
classifier =
    Environment :: OpenStack
    Intended Audience :: Information Technology
    Intended Audience :: System Administrators
    License :: OSI Approved :: Apache Software License
    Operating System :: POSIX :: Linux
    Programming Language :: Python
    Programming Language :: Python :: 2
    Programming Language :: Python :: 2.7

The contents in the [] means config name. such as name means key, the below means value.

but how about the Environment :: OpenStack , does the :: have practical meaning?

Answer 1

No, the :: has no special meaning other that that's the picked delimiter for Trover classifier levels .

The classifiers are just metadata, helping people find specific packages and learn what the package is about. The package maintainer picks these when writing the setup.py script; the setup.cfg file is an alternative way of specifying the same.

Answer 2

The double-colon, in this case, is the classifier namespace separator. It is not Python syntax, it's the naming conventions for the categories on PyPI .