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This lets you easily introspect and alter any objects in your running process.

$ python
>>> x = 'foo'

$ pyrasite <PID> payloads/reverse_python_shell.py
$ nc -l localhost 9001
Python 2.7.1 (r271:86832, Apr 12 2011, 16:15:16)
[GCC 4.6.0 20110331 (Red Hat 4.6.0-2)]
Type 'quit' to exit.
>>> print x
foo
>>> globals()['x'] = 'bar'

Cool debugging tool. Has nice wrapper for meliae Python memory analyser (https://launchpad.net/meliae). Via http://news.ycombinator.com/item?id=3014484.