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Date: Mon, 24 Nov 2014 17:08:12 +0530
Subject: PYTHON LOGGING with StreamHandler and FileHandler
From: Ganesh Pal <ganesh1pal@gmail.com>
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Hi Team,


The below program logs all the messages to the log file and displays the
same on the console .

Please suggest how do I ensure that error and warning log levels go ONLY to
stdout and/or stder


Code :

import logging
import sys

# StreamHandler
root = logging.getLogger()
root.setLevel(logging.DEBUG)

ch = logging.StreamHandler(sys.stdout)
ch.setLevel(logging.DEBUG)
formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s -
%(message)s')
ch.setFormatter(formatter)
root.addHandler(ch)


# FileHandler

logger = logging.getLogger('myapp')
ch  = logging.FileHandler('/var/tmp/myapp1.log')
logger.setLevel(logging.DEBUG)

logger.error('We have a problem')
logger.info('While this is just chatty')
print "error abort" ## should be displayed on screen with using
loggin.<something>

output :

# python  modified_logger.py
2014-11-24 11:18:12,355 - myapp - ERROR - We have a problem
2014-11-24 11:18:12,356 - myapp - INFO - While this is just chatty
error abort

# echo > /var/tmp/myapp1.log
# python  modified_logger.py
2014-11-24 11:18:45,872 - myapp - ERROR - We have a problem
2014-11-24 11:18:45,872 - myapp - INFO - While this is just chatty
error abort

Regards,
Ganesh

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<div dir=3D"ltr"><div><br></div><div>Hi Team,</div><div><br></div><div><br>=
</div><div>The below program logs all the messages to the log file and disp=
lays the same on the console .</div><div><br></div><div>Please suggest how =
do I ensure that e<span style=3D"color:rgb(0,0,0);font-size:10pt;white-spac=
e:pre-wrap;background-color:rgb(250,250,250)">rror and warning log levels g=
o ONLY to stdout and/or stder </span></div><div><span style=3D"color:rgb(0,=
0,0);font-size:10pt;white-space:pre-wrap;background-color:rgb(250,250,250)"=
><br></span></div><div><br></div><div>Code :</div><div><br></div><div>impor=
t logging</div><div>import sys</div><div><br></div><div># StreamHandler</di=
v><div>root =3D logging.getLogger()</div><div>root.setLevel(logging.DEBUG)<=
/div><div><br></div><div>ch =3D logging.StreamHandler(sys.stdout)</div><div=
>ch.setLevel(logging.DEBUG)</div><div>formatter =3D logging.Formatter(&#39;=
%(asctime)s - %(name)s - %(levelname)s - %(message)s&#39;)</div><div>ch.set=
Formatter(formatter)</div><div>root.addHandler(ch)</div><div><br></div><div=
><br></div><div># FileHandler</div><div><br></div><div>logger =3D logging.g=
etLogger(&#39;myapp&#39;)</div><div>ch =C2=A0=3D logging.FileHandler(&#39;/=
var/tmp/myapp1.log&#39;)</div><div>logger.setLevel(logging.DEBUG)</div><div=
><br></div><div>logger.error(&#39;We have a problem&#39;)</div><div><a href=
=3D"http://logger.info">logger.info</a>(&#39;While this is just chatty&#39;=
)</div><div>print &quot;error abort&quot; ## should be displayed on screen =
with using loggin.&lt;something&gt;</div><div><br></div><div>output :=C2=A0=
</div><div><br></div><div><div># python =C2=A0modified_logger.py</div><div>=
2014-11-24 11:18:12,355 - myapp - ERROR - We have a problem</div><div>2014-=
11-24 11:18:12,356 - myapp - INFO - While this is just chatty</div><div>err=
or abort</div><div><br></div><div># echo &gt; /var/tmp/myapp1.log</div><div=
># python =C2=A0modified_logger.py</div><div>2014-11-24 11:18:45,872 - myap=
p - ERROR - We have a problem</div><div>2014-11-24 11:18:45,872 - myapp - I=
NFO - While this is just chatty</div><div>error abort</div></div><div><br><=
/div><div>Regards,</div><div>Ganesh</div></div>

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