import logging
 
 
query = 'http://{ADDR}/query/ta?begin={BEGIN}&end={END}'
log_file = 'log_file.txt'
logging.basicConfig(filename=log_file, level=logging.INFO, filemode='a', format='%(levelname)-8s %(asctime)s %(message) 19s', datefmt='%Y-%m-%d %H:%M:%S')
 
init_datetime = datetime.now().strftime('%Y%m%d')
current_datetime = datetime.now().strftime('%Y%m%d')
 
query = query.format(ADDR='some.controller.ru', BEGIN=init_datetime, END=current_datetime)
logging.info(query)
try:
    resp = request.urlopen(query)
    body = resp.readall()
    logging.info(body)
except Exception:
    logging.error(traceback.format_exc())  # вот конкретно вывод отладочной инфы во много строк смотрися некрасиво, всё съезжает налево, после отступа на новую строку в файле.

INFO     2013-08-02 10:52:03 http://some.controller.ru/query/ta?begin=20130802&end=20130802
ERROR    2013-08-02 10:52:03 Traceback (most recent call last):
  File "C:\Python32\lib\urllib\request.py", line 1140, in do_open
    h.request(req.get_method(), req.selector, req.data, headers)
  File "C:\Python32\lib\http\client.py", line 983, in request
    self._send_request(method, url, body, headers)
  File "C:\Python32\lib\http\client.py", line 1021, in _send_request
    self.endheaders(body)
  File "C:\Python32\lib\http\client.py", line 979, in endheaders
    self._send_output(message_body)
  File "C:\Python32\lib\http\client.py", line 824, in _send_output
    self.send(msg)
  File "C:\Python32\lib\http\client.py", line 762, in send
    self.connect()
  File "C:\Python32\lib\http\client.py", line 740, in connect
    self.timeout, self.source_address)
  File "C:\Python32\lib\socket.py", line 408, in create_connection
    for res in getaddrinfo(host, port, 0, SOCK_STREAM):
socket.gaierror: [Errno 11004] getaddrinfo failed

INFO     2013-08-02 10:52:03 http://some.controller.ru/query/ta?begin=20130802&end=20130802
ERROR    2013-08-02 10:52:03 Traceback (most recent call last):
                             File "C:\Python32\lib\urllib\request.py", line 1140, in do_open
                               h.request(req.get_method(), req.selector, req.data, headers)
                             File "C:\Python32\lib\http\client.py", line 983, in request
                               self._send_request(method, url, body, headers)

import logging, traceback
def a():
    def b():
        return "  " * "  "
    b()
      
def g():
    return a()
 
log_file = 'log_file.txt'
logging.basicConfig(filename=log_file, level=logging.INFO, filemode='a', format='%(levelname)s %(asctime)s %(message)s', datefmt='%Y-%m-%d %H:%M:%S')
try:
    g()
except Exception:
    tb = traceback.format_exc()
    tb =  "\n                             ".join(tb.split("\n"))
    logging.error(tb)

ERROR    2013-08-02 13:30:15 Traceback (most recent call last):
                               File "<pyshell#17>", line 16, in <module>
                                 g()
                               File "<pyshell#17>", line 9, in g
                                 return a()
                               File "<pyshell#17>", line 6, in a
                                 b()
                               File "<pyshell#17>", line 5, in b
                                 return "  " * "  "
                             TypeError: can't multiply sequence by non-int of type 'str'

#!/usr/bin/env python
import logging
def foo():
	1/0
def bar():
	foo()
def main():
	logging.info('multi-\nline\nmessage')
	bar()
class MyFormatter(logging.Formatter):
	def format(self, record):
		message = logging.Formatter.format(self, record)
		if '\n' in message:
			fmtcut = self._fmt.find('%(message)s')
			if 0 < fmtcut:
				indent  = len(self._fmt[:fmtcut] % record.__dict__)
				indent  = ' '*indent
				message = indent.join(message.splitlines(True))
		return message
if __name__ == '__main__':
	formatter = MyFormatter(
		'%(levelname)s %(asctime)s %(message)s',
		'%Y-%m-%d %H:%M:%S')
	handler = logging.StreamHandler()
	handler.setFormatter(formatter)
	assert not logging.root.handlers
	logging.root.addHandler(handler)
	logging.root.setLevel(logging.NOTSET)
	try:
		main()
	except Exception:
		logging.exception('Unhandled exception')