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Class that represents a interactive interface. It has its own
namespace. Use eval_context.exec_expr(expr) to run commands; the
output of those commands is returned, as are print statements.
This is essentially what doctest does, and is taken directly from
doctest.
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A specialized version of the python debugger that redirects stdout
to a given stream when interacting with the user. Stdout is *not*
redirected when traced code is executed.
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