Improved formatting of TypeErrors encountered in ctml_writer.py

interfaces/python/ctml_writer.py

@@ -2368,6 +2368,25 @@ def convert(filename):
                 print ' '* (err.offset+9) + '^'
         print
         sys.exit(3)
+    except TypeError as err:
+        import traceback
+
+        text = open(filename).readlines()
+        tb = traceback.extract_tb(sys.exc_info()[2])
+        lineno = tb[-1][1]
+
+        print '%s on line %i of %s:' % (err.__class__.__name__, lineno, filename)
+        print err
+        print '\n| Line |'
+
+        for i in range(max(lineno-6, 0),
+                       min(lineno+3, len(text))):
+            if i == lineno-1:
+                print '> % 4i >' % (i+1), text[i].rstrip()
+            else:
+                print '| % 4i |' % (i+1), text[i].rstrip()
+
+        sys.exit(4)
 
     write()