This only applies to the basepython repl, everything works inIPython repls.

In discussion onb2fbae7 discovered thatsys.displayhook only gets evaluated for expressions, not statements.

This means that things like

importnumpypassa=b

will not trigger the auto-redrawing. This is particularly troubling because this mean

ln,=ax.plot(...)

will not trigger a re-draw, but

ax.plot(...)

will.

Due tob2fbae7, where we rely on the auto-redrawing to trigger thepyplot redrawing this means that manypyplot workflows in the normal repl are broken (as in things that used to auto-redraw no longer do).

The options I think are:

1. figure out how to trigger a call back on statements (if this is possible, it is well hidden. There may be a reason IPython completely re-wrote the execution handling)
2. say we only support interactive plotting with the IPython repl (which is a major regression)
3. revert the removal ofdraw_if_interactive which maintains some functions as 'special'

I suspect that the answer is going to be both 2 and 3. normal python shell keeps current functionality and gainssome new functionality, IPython picks up lots of new functionality, and the code base keeps this particular wart.