Let's say something like this is being returned.

Traceback (most recent call last):
  File "/usr/local/scripts/backup_databases.py", line 250, in <module>
    if object['Key'].split('.')[1]:
IndexError: list index out of range

Notice in this example that I got this on line 250 of my /usr/local/scripts/backup_databases.py script with command if object['Key'].split('.')[1]. This can be handled using try except error handling.

try:
  object['Key'].split('.')[1]
except IndexError:
  pass
else:
  obj = object['Key'].split('.')[1]