Get exception description and stack trace which caused an exception, all as a string

Question

I\'ve seen a lot of posts about stack trace and exceptions in Python. But haven\'t found what I need.

I have a chunk of Python 2.7 code that may raise an exception.

Answer 1

I defined following helper class:

import traceback
class TracedExeptions(object):
    def __init__(self):
        pass
    def __enter__(self):
        pass

    def __exit__(self, etype, value, tb):
      if value :
        if not hasattr(value, 'traceString'):
          value.traceString = "\n".join(traceback.format_exception(etype, value, tb))
        return False
      return True

Which I can later use like this:

with TracedExeptions():
  #some-code-which-might-throw-any-exception

And later can consume it like this:

def log_err(ex):
  if hasattr(ex, 'traceString'):
    print("ERROR:{}".format(ex.traceString));
  else:
    print("ERROR:{}".format(ex));

(Background: I was frustraded because of using Promises together with Exceptions, which unfortunately passes exceptions raised in one place to a on_rejected handler in another place, and thus it is difficult to get the traceback from original location)