how to return error message in python code example

Example 1: python get exception message

try:
    with open(filepath,'rb') as f:
        con.storbinary('STOR '+ filepath, f)
    logger.info('File successfully uploaded to '+ FTPADDR)
except Exception as e: # work on python 3.x
    logger.error('Failed to upload to ftp: '+ str(e))

Example 2: try except python

def sum_of(x, y):
  try:
    print(x + y)
  except TypeError:
    print("Invalid argument specified.")