Github user felixcheung commented on the issue:
https://github.com/apache/zeppelin/pull/2207
right, I think it's everything that is called after calling `exec(code)`,
might have been overwritten by the user code
```
or node in to_run_exec:
mod = ast.Module([node])
code = compile(mod, '<stdin>', 'exec')
exec(code)
for node in to_run_single:
mod = ast.Interactive([node])
code = compile(mod, '<stdin>', 'single')
exec(code)
for node in to_run_hooks:
mod = ast.Module([node])
code = compile(mod, '<stdin>', 'exec')
exec(code)
```
so I think: `intp`, `output`
and perhaps `to_run_exec`, `to_run_single`, `to_run_hooks`?
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