1 #!/usr/bin/env python

     2 

     3 # Filters traceback lines from stdin.

     4 

     5 from __future__ import absolute_import, print_function

     6 

     7 import sys

     8 

     9 state = 'none'

    10 

    11 for line in sys.stdin:

    12     if state == 'none':

    13         if line.startswith('Traceback '):

    14             state = 'tb'

    15 

    16     elif state == 'tb':

    17         if line.startswith('  File '):

    18             state = 'file'

    19             continue

    20 

    21         elif not line.startswith(' '):

    22             state = 'none'

    23 

    24     elif state == 'file':

    25         # Ignore lines after "  File "

    26         state = 'tb'

    27         continue

    28 

    29     print(line, end='')