Breakpoints in expression / template code in Plone

Question

If you have a situation where a TAL expression doesn't work (example below):

context.restrictedTraverse('@@contenthistory').fullHistory()[0]['comments']

What options there exist to debug this situation. Namely, can one put breakpoints to

• TAL templates

• TAL expression

• Any expressions (e.g. portal_actions)

Answer 1

If you are using Chameleon (you should!) you can use this:

<?python import pdb; pdb.set_trace() ?>

The stuff you normally look for is accessible in 'econtext':

econtext['context']
econtext['request']