AW: traceback as string

[Oliver Walczak]

This seems to be a quite difficult approach. Try this:
############### ############### ############### ############### #########
import traceback

class MyTraceback:
def __init__(self):
self.clear()
def clear(self):
self.s = ''
def write(self, s):
self.s += s
def read(self):
return self.s
def catch(self):
traceback.print _exc(None, self)

if __name__ == '__main__':
myTcb = MyTraceback()
try:
a = 1/0
except:
myTcb.clear()
myTcb.catch()
print myTcb.read()
############### ############### ############### ############### ##########

Call clear() each time before you expect a new traceback output. You can
import this class and don't need to import traceback in your main project.
Oliver



"John Hunter" <jdhunter@ace.b sd.uchicago.edu > wrote in message
news:mailman.20 2.1071593230.93 07.python-list@python.org ...[color=blue]
>
> What is the best way to get the traceback as a string.[/color]

I define the following module "Excepts.py " for logging exceptions in daemon
processes:

------------------------------------------
import sys,traceback

def error():
tb =
traceback.forma t_exception(sys .exc_info()[0],sys.exc_info()[1],sys.exc_info(
)[2])
return tb[len(tb)-1].replace('\n',' ')

def errorstack():
return
''.join(traceba ck.format_excep tion(sys.exc_in fo()[0],sys.exc_info()[1],sys.e
xc_info()[2]))
-------------------------------------------

Colin Brown
PyNZ


--

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[Bengt Richter]

Re: AW: traceback as string

On Thu, 18 Dec 2003 11:44:46 +0100, "Oliver Walczak" <oliver.walczak @momatec.de> wrote:
[color=blue]
>This seems to be a quite difficult approach. Try this:[/color]
[ snip nice code]
Here is a variant with repeat counting (may be a bit format-sensitive):
I rather wish something like it was built into the traceback print itself,
especially when recursing forever interactively, and one loses initial output context.

############### ############### ############### ############### #########
import traceback

class MyTraceback:
def __init__(self):
self.clear()
def clear(self):
self.line = []
self.lines = []
self.repeat = 0
def write(self, s):
self.line.appen d(s)
if s[-1:] == '\n':
s = ''.join(self.li ne)
self.line = []
self.lines.appe nd(s)
if len(self.lines) >=4 and self.lines[-4:-2] == self.lines[-2:]:
self.repeat += 1
del self.lines[-2:]
else:
if self.repeat and s!= self.lines[-3]:
if self.repeat==1:
self.lines.exte nd(self.lines[-2:])
else:
self.lines.inse rt(-1,
' *** previous two lines repeated %s times ***\n\n'% self.repeat)
self.repeat = 0
def read(self):
return ''.join(self.li nes + self.line)
def catch(self):
traceback.print _exc(None, self)

if __name__ == '__main__':
myTcb = MyTraceback()
def foo(n):
if n<0: foo(n) # blow stack
print '---> foo(%s)'%n
if n>0: foo(n-1)
1/0
try:
foo(5)
except:
myTcb.clear()
myTcb.catch()
print myTcb.read()
try:
foo(-5)
except:
myTcb.clear()
myTcb.catch()
print myTcb.read()
############### ############### ############### ############### ##########

Result:

[13:19] C:\pywk\clp>myt racebk.py
---> foo(5)
---> foo(4)
---> foo(3)
---> foo(2)
---> foo(1)
---> foo(0)
Traceback (most recent call last):
File "C:\pywk\clp\my tracebk.py", line 41, in ?
foo(5)
File "C:\pywk\clp\my tracebk.py", line 38, in foo
if n>0: foo(n-1)
*** previous two lines repeated 4 times ***

File "C:\pywk\clp\my tracebk.py", line 39, in foo
1/0
ZeroDivisionErr or: integer division or modulo by zero

Traceback (most recent call last):
File "C:\pywk\clp\my tracebk.py", line 47, in ?
foo(-5)
File "C:\pywk\clp\my tracebk.py", line 36, in foo
if n<0: foo(n) # blow stack
*** previous two lines repeated 998 times ***

RuntimeError: maximum recursion depth exceeded

Regards,
Bengt Richter