sagemath/sagecell — Issue #266: Certain errors cause evaluation to fail without printing errors
Author: ihanson
Created: 2012-03-06 18:18:34+00:00
State: open

If you run the code:

```python
print "start"
print Integer(3).x
print "end"
```
in the Sage notebook, it (correctly) prints:

```
start
Traceback (click to the left of this block for traceback)
...
AttributeError: 'sage.rings.integer.Integer' object has no attribute 'x'
```

However, if you run it on the single-cell server, it just prints

```
start
```
with no errors. It doesn’t even receive the end-of-session message.