debugging - Enumerate or list all variables in a program of [your favorite language here]

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Answer 1

In python, using locals which returns a dictionary containing all the local bindings, thus, avoiding eval:

>>> foo1 = "Hello world"
>>> foo2 = "bar"
>>> foo3 = {"1":"a",
...         "2":"b"}
>>> foo4 = "1+1"

>>> import pprint
>>> pprint.pprint(locals())
{'__builtins__': <module '__builtin__' (built-in)>,
 '__doc__': None,
 '__name__': '__main__',
 'foo1': 'Hello world',
 'foo2': 'bar',
 'foo3': {'1': 'a', '2': 'b'},
 'foo4': '1+1',
 'pprint': <module 'pprint' from '/usr/lib/python2.5/pprint.pyc'>}