Python查找函数

我可以告诉你为什么它不起作用,但我在这一点上没有一个干净的解决方案。给定的模板编译成以下Python代码:

# -*- encoding:utf-8 -*-
from mako import runtime, filters, cache
UNDEFINED = runtime.UNDEFINED
__M_dict_builtin = dict
__M_locals_builtin = locals
_magic_number = 5
_modified_time = 1285968547.0498569
_template_filename='<snip>'
_template_uri='<snip>'
_template_cache=cache.Cache(__name__, _modified_time)
_source_encoding='utf-8'
_exports = ['function']


# SOURCE LINE 1

lookup = { 'key': function }


def render_body(context,**pageargs):
    context.caller_stack._push_frame()
    try:
        __M_locals = __M_dict_builtin(pageargs=pageargs)
        __M_writer = context.writer()
        # SOURCE LINE 3
        __M_writer(u'\n\n')
        # SOURCE LINE 7
        __M_writer(u'\n')
        return ''
    finally:
        context.caller_stack._pop_frame()


def render_function(context):
    context.caller_stack._push_frame()
    try:
        __M_writer = context.writer()
        # SOURCE LINE 5
        __M_writer(u'\n    Output\n')
        return ''
    finally:
        context.caller_stack._pop_frame()

正如你所看到的 function 实际上被定义为 render_function . The Mako docs specify how to call defs from outside a template ,但它们没有指明如何在运行时正确地执行此操作。我链接的代码只是简单地查找 "render_%s" % name (见mako.模板,第217行),所以你 可以 考虑一下这样做。

也许你可以推迟查找 function

<%!
    lookup = { 'key': lambda: function() }
%>

我没有使用Mako,但它在Python shell中工作:

>>> x = lambda: foo()
>>> x
<function <lambda> at 0x10047e050>
>>> x()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 1, in <lambda>
NameError: global name 'foo' is not defined
>>> def foo():
...    print "Test"
... 
>>> x()
Test