sample.py

# -*- coding:utf-8 -*-

from mako.template import Template
from mako.lookup import TemplateLookup
mylookup = TemplateLookup(directories=["."])

with open("source.mako", "w") as w:
    w.write("""
<div id="header">
<%block name="header">
  header
</%block>
</div>

<div id="main">
<%block name="main">
  main
</%block>
</div>

<div id="footer">
<%block name="footer">
  footer
</%block>
</div>
""")

def generate_blocks(context, names, dict_name):
    for name in names:
        context.write("""\
<%%block name="%s">
  ${%s["%s"]}
</%%block>
""" % (name, dict_name, name))


template_generate_template = Template("""\
<%text>
<%inherit file="source.mako"/>
</%text>
<%namespace name="smpl" module="sample"/>
${smpl.generate_blocks(names, block_name)}
""", lookup=mylookup)

template_src = template_generate_template.render(
        names=["header", "main", "footer"], block_name="blocks"
        )

template = Template(template_src, lookup=mylookup)

output = template.render(blocks={"header": "<div>header_body</div>", 
                        "main": "<p>main_bod</p>", 
                        "footer": "<div>footer_body</div>", 
                        })

print output

""" ## why output 2times?
<div id="header">

  <div>header_body</div>

</div>

<div id="main">

  <p>main_bod</p>

</div>

<div id="footer">

  <div>footer_body</div>

</div>


<div id="header">

  <div>header_body</div>

</div>

<div id="main">

  <p>main_bod</p>

</div>

<div id="footer">

  <div>footer_body</div>

</div>
"""