Access variables defined in Mako namespace

Question

Normally, "importing" a namespace in Mako appears to only allow access to defs.

## base.mako
<%
  somevar = ["one", "two", "three"]
%>

<%def name="foo()">Bar</%def>

And an importing template:

## child.mako
<%namespace name="base" file="base.mako" />

${base.foo()} # works
${base.somevar} # fails: no soup for you

In my use case somevar and foo are related. It would be convenient for me to also be able to access somevar from within the importing template. What is the best practice for doing this?

@9000: Normally `somevar` will be an arbitrary python object used as an argument for a function or def rather than just a string output to the template body when rendered. I'm sorry for being dense: how do I write/call getSomeVar() in that case? — sink, Jul 14 '11 at 18:16
You can import function foo, but not a plain name somevar. You could define `def getSomeVar(): return somevar` in base and hopefully use `base.getSomeVar()` as you would `somevar`. — 9000, Jul 14 '11 at 21:42

score 4 · Answer 1 · answered Dec 06 '11 at 11:12

4

I've had the same problem - the answer is in the documentation on inheritance:

The attr accessor of the Namespace object allows access to module level variables declared in a template. By accessing self.attr, you can access regular attributes from the inheritance chain as declared in <%! %> sections.

Thus you want base.attr.somevar I think.

answered Dec 06 '11 at 11:12

cdyson37

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This will only work for [module-level blocks](https://docs.makotemplates.org/en/latest/syntax.html#module-level-blocks) `<%! … %>`, not regular [Python blocks](https://docs.makotemplates.org/en/latest/syntax.html#python-blocks) `<% … %>`. :( – K3---rnc Jan 23 '19 at 14:45

score 2 · Answer 2 · answered Jul 15 '11 at 01:15

As user 9000 suggests above, I figured out one way to do it. I'm posting it so it is documented in case somebody else needs it but I still hope somebody with more expertise can chip in with a better way.

As far as I can tell you can't access functions defined in a module block through the namespace, but you can access a <%def>. By default <%def> blocks dump straight to the context buffer so you have to do some contortions:

## base.mako
<%!
  somevar = ["one", "two", "three"]
%>

<%def name="getSomeVar()">
  <%
    return somevar
  %>
</%def>

Then from another template import the base.mako namespace as base and access${base.getSomeVar()} to get the value of somevar.

Access variables defined in Mako namespace

2 Answers2