zcml:condition 的有效条件是什么？
ZCML 可以包含以下形式的条件指令：
<configure zcml:condition="installed some.python.package">
(conditional configuration directives)
</configure>
condition 的表达式语法是什么？允许“或”吗？
ZCML can include conditional directives of the form
<configure zcml:condition="installed some.python.package">
(conditional configuration directives)
</configure>
What is the expression syntax for condition? Is 'or' allowed?
如果你对这篇内容有疑问，欢迎到本站社区发帖提问 参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。
绑定邮箱获取回复消息
由于您还没有绑定你的真实邮箱，如果其他用户或者作者回复了您的评论，将不能在第一时间通知您！
发布评论
评论（1）
我也总是要查一下这个。语法非常简单，恐怕
or不是语法的一部分。正如您可以从 zope.configuration 源代码中的文档，语法始终采用
verb argument形式，其中 verb 是have、<代码>未安装、<代码>已安装和<代码>未安装。have和not-have测试已注册的功能。注册的功能只是一个使用已安装和未安装只需尝试导入指定的包；如果导入成功，installed测试也会成功。例子：I always have to look this up too. The syntax is very simple, and
oris not part of the syntax, I am afraid.As you can see from the documentation in the zope.configuration source code, the syntax is always of the form
verb arguments, where verb is one ofhave,not-have,installedandnot-installed.haveandnot-havetest for a registered feature. A registered feature is simply an opaque string that has been registered with a<meta:provides feature="something" />tag. Use it to flag that something has been included without tying it to a particular implementation. Example:installedandnot-installedsimply try to import the named package; if the import succeeds so does theinstalledtest. Example: