bpython seems to be affected by the same issues as IPython that are described here: inducer/pudb#103

For example, when debugging via pudb and bpython:

>>> tags.keys()
dict_keys(['foo', 'bar'])
>>> [key for key in tags.keys()]
['foo', 'bar']
>>> [name in tags.keys() for name in container_names]
Traceback (most recent call last):
  File "<pudb command line>", line 1, in <module>
  File "<pudb command line>", line 1, in <listcomp>
NameError: name 'tags' is not defined

A very puzzling error.

Note that globals().update(locals()) is a temporary fix but it must be run manually every time I want access to a new local variable in a list comprehension, as described in this comment to the pudb issue linked above.