add test for and fix namede exceptions : GH #137

asteval/asteval.py

@@ -867,7 +867,7 @@ def on_try(self, node):    # ('body', 'handlers', 'orelse', 'finalbody')
                     if htype is None or isinstance(e_type(), htype):
                         self.error = []
                         if hnd.name is not None:
-                            self.node_assign(hnd.name, e_value)
+                            self.symtable[hnd.name] = e_value
                         for tline in hnd.body:
                             self.run(tline)
                         break

tests/test_asteval.py

@@ -1588,5 +1588,21 @@ def my_func(x, y):
     assert etype == 'AttributeError'
 
 
+@pytest.mark.parametrize("nested", [False, True])
+def test_naming_exceptions(nested):
+    """ fixing Github issue #137"
+    interp = make_interpreter(nested_symtable=nested)
+    try_with_named_error = textwrap.dedent("""
+         try:
+             2 + ''
+         except Exception as my_error:
+            print(my_error)
+     """)
+
+    interp(try_with_named_error, raise_errors=True)
+    out = read_stdout(interp)
+    assert 'unsupported operand' in out
+    assert len(interp.error) == 0
+
 if __name__ == '__main__':
     pytest.main(['-v', '-x', '-s'])