Python exceptions don't preserve class

[wusspuss]

Not sure if this is the intended behavior {1:2,4:5}[6] in regular python will give something like

Traceback (most recent call last):
  <traceback here ...>
KeyError: 6

While calling python through tohil will produce

'6' (error in python object call)
from python code executed by tohil
<tracback here ...>

That '6' may be quite confusing, and potentially important information is lost about the exception (the fact that it's a keyerror). Since this behavior works fine and makes sense for some cases like say ZeroDivisionError: division by zero -> division by zero, I don't know if it is indeed intended. However, even tcl's own dict get {1 2} 3 won't just say 3, rather key "3" not known in dictionary. Would it be ok to make tohil return the exception class name along the description?

[wusspuss]

Would a PR changing the behavior to smth like KeyError 6 be accepted? Tests would have to be updated and I don't think backwards compatibility would be possible

[NasaGeek]

We do capture the exception type, but it's socked away in $errorCode

% tohil::eval {[][0]}
list index out of range
% puts $errorCode
PYTHON IndexError {list index out of range}

I'll think a bit on how best we could include this information in a more visible way.