Problem with string containing two or more question marks

[selasley]

If I have a notebook with a code cell containing a string with two or more question marks I see a
SyntaxError: Unexpected token ':'. Parse error.
message in orange near the top of the window and ipython says Autosave Failed!
If I close and halt, then reopen the notebook the ?? in the string is replaced by a string such as jQuery203021335813379846513_1413224722980. So

s = "??"

s = "jQuery20306843485713470727_1413224771225"

s = "????"
->
s = "jQuery20303224137818906456_1413225105052??"

I am seeing this with ipython 3.0.0-dev ddc0593 and the Safari web browser

[takluyver]

Not seeing this in Firefox.

[selasley]

I see it in FireFox 32.0.3 under OS X. I am using python installed with python 3.4.2. The jQuery string appears in the ipynb file when I use the Save and Checkpoint menu item. If I change the jQuery string to ???? in the ipynb file when it is not open, then open it in the notebook I see s = "????" After I Save and Checkpoint again I see the warning about a syntax error and the jQuery string appears in the ipynb file.

[Carreau]

Can you share one of these notebook ?

[selasley]

Here is a notebook I created using ipython 2.3.0 http://pastebin.com/iesdxv0Y
I can open, Save and Checkpoint, close and reopen this notebook using ipython 2.3.0 with no problems
If I open the notebook with ipython 3.0.0 dev commit f958ffa, select File->Save and Checkpoint, then look at the ipynb file in a text editor "s = "??"\n", is replaced by "s = "jQuery203042744921061269603_1413308473753"\n",
If I Close and halt then open the notebook again I see s = "jQuery20305214854673710887_1413308784993" in the notebook but z = "??" is not changed.
After I Save and Chekpoint the file a second time, close it and open it again I see z = "jQuery20304426873527968228_1413308796891"
Save, close and a third time and Out[1] is now 'jQuery203016830453436175863_1413308850862' instead of '??'
I'm running python 3.4.2 from python.org in OS X 10.9.5. I see this problem in Firefox 32.0.3 and Safari 7.1 with extensions disabled. When I look at the Error console in Safari after loading the notebook I see these two errors
[Error] Failed to load resource: the server responded with a status of 404 (Not Found) (jquery.min.map, line 0)
[Error] Failed to load resource: the server responded with a status of 404 (Not Found) (underscore-min.map, line 0)
I don't see these errors in the Firefox Debugger console so they may not be relevant.
If nobody else can reproduce this problem I'll just chalk it up to a quirk in my setup.

[takluyver]

I've tried again with your notebook, and I still don't see the bug (Firefox 32, Python 3.4.2, Linux). Someone with a Mac should try to reproduce this.

[minrk]

I can reproduce it. It's jQuery's implicit JSONP logic, which is super weird. Fix in #6693.

[aflaxman]

I just ran into this bug, and I have an IPython from the git repo that was updated one day before this fix was merged! Lucky me?

Thanks for being so on it, folks! You rock.