Question

Consider this code:

import logging
print "print"
logging.error("log")

I get:

print
ERROR:root:log

now if I include a thid-party module at the beginning of the previous code and rerun it I get only:

print

there are some previous question about this, but here I cannot touch the module I’m importing.

The code of the third-party module is here: http://atlas-sw.cern.ch/cgi-bin/viewcvs-atlas.cgi/offline/DataManagement/DQ2/dq2.clientapi/lib/dq2/clientapi/DQ2.py?view=markup, but my question is more general: independently of the module I’m importing I want a clean logging working in the expected way

Some (non-working) proposed solutions:

from dq2.clientapi.DQ2 import DQ2
import logging
del logging.root.handlers[:]

---

from dq2.clientapi.DQ2 import DQ2
import logging
logging.disable(logging.NOTSET)

---

logs = logging.getLogger('root')
logs.error("Some error")

---

the next one works, but produced some additional errors:

from dq2.clientapi.DQ2 import DQ2
import logging
reload(logging)

I get:

print
ERROR:root:log
Error in atexit._run_exitfuncs:
Traceback (most recent call last):
  File "/afs/cern.ch/sw/lcg/external/Python/2.6.5/x86_64-slc5-gcc43-    opt/lib/python2.6/atexit.py", line 24, in _run_exitfuncs
    func(*targs, **kargs)
  File "/afs/cern.ch/sw/lcg/external/Python/2.6.5/x86_64-slc5-gcc43-opt/lib/python2.6/logging/__init__.py", line 1509, in shutdown
    h.close()
  File "/afs/cern.ch/sw/lcg/external/Python/2.6.5/x86_64-slc5-gcc43-opt/lib/python2.6/logging/__init__.py", line 705, in close
    del _handlers[self]
KeyError: <logging.StreamHandler instance at 0x2aea031f7248>
Error in sys.exitfunc:
Traceback (most recent call last):
  File "/afs/cern.ch/sw/lcg/external/Python/2.6.5/x86_64-slc5-gcc43-opt/lib/python2.6/atexit.py", line 24, in _run_exitfuncs
    func(*targs, **kargs)
  File "/afs/cern.ch/sw/lcg/external/Python/2.6.5/x86_64-slc5-gcc43-opt/lib/python2.6/logging/__init__.py", line 1509, in shutdown
    h.close()
  File "/afs/cern.ch/sw/lcg/external/Python/2.6.5/x86_64-slc5-gcc43-opt/lib/python2.6/logging/__init__.py", line 705, in close
    del _handlers[self]
KeyError: <logging.StreamHandler instance at 0x2aea031f7248>

---

from dq2.clientapi.DQ2 import DQ2
import logging
logger = logging.getLogger(__name__)
ch = logging.StreamHandler()  
logger.addHandler(ch)
logger.error("log")

Answer 1

It depends on what the other module is doing; e.g. if it’s calling logging.disable then you can call logging.disable(logging.NOTSET) to reset it.

You could try reloading the logging module:

from importlib import reload
logging.shutdown()
reload(logging)

The problem is this will leave the third-party module with its own copy of logging in an unusable state, so could cause more problems later.