[Python-bugs-list] [ python-Bugs-431772 ] traceback.print_exc() causes traceback

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Bugs item #431772, was updated on 2001-06-10 00:55
You can respond by visiting: 
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>Category: Python Library
Group: None
>Status: Closed
>Resolution: Fixed
Priority: 5
Submitted By: Atsuo Ishimoto (atsuoi)
>Assigned to: Tim Peters (tim_one)
Summary: traceback.print_exc() causes traceback

Initial Comment:
Executing this code:

import traceback
try:
    comp = compile('def aaa
(a=1,b):pass', '<interactive input>','exec')
except:
    traceback.print_exc()


causes exception with Python 2.1/Win32.

Traceback (most recent call last):
  File "a.py", line 3, in ?
    comp = compile('def aaa
(a=1,b):pass', '<interactive input>','exec')
Traceback (most recent call last):
  File "a.py", line 5, in ?
    traceback.print_exc()
  File "c:\tools\python21\lib\traceback.py", line 209, 
in print_exc
    print_exception(etype, value, tb, limit, file)
  File "c:\tools\python21\lib\traceback.py", line 124, 
in print_exception
    lines = format_exception_only(etype, value)
  File "c:\tools\python21\lib\traceback.py", line 175, 
in format_exception_only
    while i < len(line) and line[i].isspace():
TypeError: len() of unsized object



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>Comment By: Tim Peters (tim_one)
Date: 2001-06-10 11:58

Message:
Logged In: YES 
user_id=31435

Thank you, Michael!  I checked this in,
Lib/traceback.py, rev 1.26.

----------------------------------------------------------------------

Comment By: Michael Hudson (mwh)
Date: 2001-06-10 04:50

Message:
Logged In: YES 
user_id=6656

I think this patch:

Index: traceback.py
===================================================================
RCS file: /cvsroot/python/python/dist/src/Lib/traceback.py,v
retrieving revision 1.25
diff -c -r1.25 traceback.py
*** traceback.py        2001/03/29 04:36:08     1.25
--- traceback.py        2001/06/10 11:48:51
***************
*** 171,189 ****
                  if not filename: filename = "<string>"
                  list.append('  File "%s", line %d\n' %
                              (filename, lineno))
!                 i = 0
!                 while i < len(line) and line[i].isspace():
!                     i = i+1
!                 list.append('    %s\n' % line.strip())
!                 if offset is not None:
!                     s = '    '
!                     for c in line[i:offset-1]:
!                         if c.isspace():
!                             s = s + c
!                         else:
!                             s = s + ' '
!                     list.append('%s^\n' % s)
!                 value = msg
          s = _some_str(value)
          if s:
              list.append('%s: %s\n' % (str(stype), s))
--- 171,190 ----
                  if not filename: filename = "<string>"
                  list.append('  File "%s", line %d\n' %
                              (filename, lineno))
!                 if line is not None:
!                     i = 0
!                     while i < len(line) and line[i].isspace():
!                         i = i+1
!                     list.append('    %s\n' % line.strip())
!                     if offset is not None:
!                         s = '    '
!                         for c in line[i:offset-1]:
!                             if c.isspace():
!                                 s = s + c
!                             else:
!                                 s = s + ' '
!                         list.append('%s^\n' % s)
!                     value = msg
          s = _some_str(value)
          if s:
              list.append('%s: %s\n' % (str(stype), s))

fixes this.


----------------------------------------------------------------------

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