Multi-line input only processes the first line

With ipython 5.0 and 5.1 (from anaconda) I have the issue that multiple lines of input in one batch via the tty are not processed correctly. Only the first line is evaluated. This can be verified via tmux and the send-keys feature:

Start ipython in a tmux session:

tmux new -s test ipython

And send two lines of code in one batch from another terminal:

tmux send-keys -t 'test' 'print 42' Enter 'print 44' Enter

Only the first line is evaluated.

[languitar]

My expectation would be that the unprocessed characters after the first enter are just queued up and processed once the first execution returns. This is the behavior that existed in previous versions and which I am used to from basically any other command-line based tool. Simply swallowing key presses doesn’t sound nice to me.

[marksteward]

I hit this all the time just because of ipython’s slow startup. I often find myself writing a couple of lines of code in the time it takes to load, and only the first of them is executed. --simple-prompt and rlwrap makes it usable again, but disables all the useful tab completion.