notebook -- bug; @interact cell eval doesn't clear out the old html output (easy to fix?)

[williamstein]

To replicate this bug:

1. Put show(plot(sin)) in a cell and press shift-enter

2. Then in the same cell delete show(plot(sin)) and replace it by this and press shift-enter:

@interact
def _(n=(1,100)):
   print n^2

3. Observe that the plot of sin is still there.

Component: notebook

Issue created by migration from https://trac.sagemath.org/ticket/2884

[williamstein]

Attachment: sage-2884.patch.gz

[boothby]

comment:3

The following is now broken:

plot(sin,0,1).show()
@interact
def foo(a="1"):
    a

[williamstein]

comment:4

Hi,

Your only reason for giving a negative review was a claim that

plot(sin,0,1).show()
@interact
def foo(a="1"):
    a

is now "broken". However, this never did what you thought it
did. The behavior in fact hasn't changed at all from how it was
before, except to remove the bug where old graphics from
the previous version of the cell remained.

@interact by design is only supposed to work when it is
the only thing in a cell.

Having multiple interacts in a cell, having additional graphics in
a cell, having nested interacts -- none of that should work at present,
since none of it has been implemented.
They're all things that would possibly be very nice to implement,
but they were not part of the design goals for the first version
of interact.

[boothby]

Attachment: 2884-docfix.patch.gz

[boothby]

comment:5

It was not clear to me, even upon rereading the documentation, that @interact had to be alone in a cell. The attached "fixes" the issue. :)

[sagetrac-mabshoff]

comment:6

Merged both patches in Sage 3.0.2.alpha1