On 25/06/14 16:20, candide wrote:
As explained by the docs, an assignment statement_evaluates_ the expression on the right
hand side. So we can deduce that at the very beginning of the 2nd prompt, "the
result of the last evaluation" is 43. Nevertheless, calling _ raises a NameError
Only expression can be evaluated, statements are executed. The shell
cannot see beyond the immediate statement.
The documentation for sys.displayhook() describes that None as a special
case is neither printed nor stored in `__builtins__._`.