Capture body content in Mako?

Is it possible to get the rendered body content from within a Mako template? What I mean is that I can displa开发者_JAVA百科y the body using ${self.body()}, but what if I want to do something to it first?

Apparently what I was looking for is the capture function. From the docs:

The other way to buffer the output of a def or any Mako callable is by using the built-in capture function. This function performs an operation similar to the above buffering operation except it is specified by the caller.

${" results " + capture(somedef) + " more results "}

Or in my case:

<%
    body = capture(self.body)
    # etc.
%>

One approach would be to pass it through a custom defined filter

<%
    def myFilter(txt): 
        return "whatever I want to do it"
>%

${self.body() | myFilter}