except IOError as e:
    if e[0] == errno.EISDIR:
        raise HTTP(403, error_message, web2py_error='file is a directory')
    elif e[0] == errno.EACCES:
        raise HTTP(403, error_message, web2py_error='inaccessible file')
    else:
        raise HTTP(404, error_message, web2py_error='invalid file')

Traceback (most recent call last):
  File "C:\web2py\gluon\main.py", line 329, in wsgibase
    response.stream(static_file, request=request)
  File "C:\web2py\gluon\globals.py", line 617, in stream
    status=self.status)
  File "C:\web2py\gluon\streamer.py", line 66, in stream_file_or_304_or_206
    if e[0] == errno.EISDIR:
TypeError: 'FileNotFoundError' object is not subscriptable