Oslo命令行解析

转自http://www.muzixing.com/pages/2014/12/19/ryuxue-xi-oslo.html
首先安装python-virtualenv，此python库可以用于创建一个虚拟的，与外界隔离的运行环境，听起来和docker好像有点像。

sudo apt-get install python-virtualenvvirtualenv example-appcd example-appsource bin/activatepip install oslo.configtouch app.pytouch app.conf

然后修改app.conf。添加了两个group:simple和morestuff。simple组中有一个BoolOpt:enable。morestuff组有StrOpt, ListOpt, DictOpt, IntOpt,和FloatOpt。

[simple]enable = True[morestuff]# StrOptmessage = Hello World# ListOptusernames = ['Licheng', 'Muzixing', 'Distance']# DictOptjobtitles = {'Licheng': 'Manager', 'Muzixing': 'CEO', 'Distance': 'Security Guard'}# IntOptpayday = 20# FloatOptpi = 3.14

修改app.py文件。首先定义两个group，再对两个group的option进行定义。最后使用register_group和register_opts函数来完成group和option的注册。

from __future__ import print_functionfrom oslo_config import cfgopt_simple_group = cfg.OptGroup(name='simple',                         title='A Simple Example')opt_morestuff_group = cfg.OptGroup(name='morestuff',                         title='A More Complex Example')simple_opts = [    cfg.BoolOpt('enable', default=False,                help=('True enables, False disables'))]morestuff_opts = [    cfg.StrOpt('message', default='No data',               help=('A message')),    cfg.ListOpt('usernames', default=None,                help=('A list of usernames')),    cfg.DictOpt('jobtitles', default=None,                help=('A dictionary of usernames and job titles')),    cfg.IntOpt('payday', default=30,                help=('Default payday monthly date')),    cfg.FloatOpt('pi', default=0.0,                help=('The value of Pi'))]CONF = cfg.CONFCONF.register_group(opt_simple_group)CONF.register_opts(simple_opts, opt_simple_group)CONF.register_group(opt_morestuff_group)CONF.register_opts(morestuff_opts, opt_morestuff_group)if __name__ == "__main__":    CONF(default_config_files=['app.conf'])    print('(simple) enable: {}'.format(CONF.simple.enable))    print('(morestuff) message :{}'.format(CONF.morestuff.message))    print('(morestuff) usernames: {}'.format(CONF.morestuff.usernames))    print('(morestuff) jobtitles: {}'.format(CONF.morestuff.jobtitles))    print('(morestuff) payday: {}'.format(CONF.morestuff.payday))    print('(morestuff) pi: {}'.format(CONF.morestuff.pi))

完成之后，运行app.py文件。可以查看到相关输出。