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as you can see from below, sys. is used, but never imported (besides a docstring)
$> git describe
upstream/0.5.0.dev-875-gf06319e
$> grep -5 'sys' /home/yoh/proj/misc/python/Tools/gdb/libpython.py
"""
During development, I've been manually invoking the code in this way:
(gdb) python
import sys
sys.path.append('/home/david/coding/python-gdb')
import libpython
end
then reloading it after each edit like this:
(gdb) python reload(libpython)
--
 def print_summary(self):
 if self.is_evalframeex():
 pyop = self.get_pyop()
 if pyop:
 sys.stdout.write('#%i %s\n' % (self.get_index(), pyop.get_truncated_repr(MAX_OUTPUT_LEN)))
 sys.stdout.write(pyop.current_line())
 else:
 sys.stdout.write('#%i (unable to read python frame information)\n' % self.get_index())
 else:
 sys.stdout.write('#%i\n' % self.get_index())
class PyList(gdb.Command):
 '''List the current Python source code, if any
 Use
--
 for i, line in enumerate(all_lines[start-1:end]):
 linestr = str(i+start)
 # Highlight current line:
 if i + start == lineno:
 linestr = '>' + linestr
 sys.stdout.write('%4s %s' % (linestr, line))
# ...and register the command:
PyList()

sorry -- git describe was by mistake in there... report is based on SVN revision 82502 

Thanks, fixed in r82874.