Exception handlers don't correctly assign to the symbol table

[W-M-T]

This code snippet reproduces the problem:

import asteval
asteval.Interpreter().eval("""
try:
    2 + ""
except Exception as err:
    print(err)
""", raise_errors=True)

OUTPUT:

NameError:    
try:
    2 + ""
except Exception as err:
    print(err)

              ^^^^
NameError: name 'err' is not defined

What's going wrong here:
From the documentation of ast.ExceptHandler:
name is a raw string for the name to hold the exception, or None if the clause doesn’t have as

In on_try, at this line

asteval/asteval/asteval.py

Line 870 in aeea1b7

self.node_assign(hnd.name, e_value)

node_assign is called with the hnd.name which is a string.
However, node_assign does not have a case for str so the exception is never assigned to a name in the symbol table.

[newville]

@W-M-T Thanks -- I will have a quick fix shortly, and hope to get 1.0.6 out in a day or so.