Context collection is not iterable

[anatoly techtonik <techtonik@…>]

While collaborating on Genshi ​debugging template it has been found that Context is not iterable and can not be inspected conveniently from template.

${locals()['__data__']} reveals that local variables are gathered into some kind of list (see repr() definition, but Context object is closer to a dictionary. But it is not a dictionary either, because the following prints keys in dict:

${"\n".join(dict(a="zxc", b="bsa"))}

But the same stuff with locals()['__data__'] produces error:

${'\n'.join(locals()['__data__'])}

File "m:\p\trac\trac-0.11dev\trac\timeline\templates\timeline.rss", 
line 19, in <Expression u"'\\n'.join(locals()['__data__'])"> 
  ${'\n'.join(locals()['__data__'])} 
File "m:\p\trac\genshi-0.5dev\genshi\template\base.py", line 184, in 
__getitem__ 
  raise KeyError(key) 

[Carsten Klein <carsten.klein@…>]

This is due to the fact that internally Context stores all context data, which are actually of type dict, in a so-called deque.

This is mainly used for allowing stacking of contexts and the way the template code is being executed.

So, when trying to access the dictionary that is associated with frame[0], which is the currently executed frame, you would have to access the dict that is stored in that frame.

Basically like so

print ctxt.frames[0]

will return the information that you want.

As such I would not call it a defect...

[hodgestar]

Moved to milestone 0.9.