Pysys. Using Pysys' log on different modules

I'd like to use PySys' log from other modules of my testing framework in order to keep all the activity from the testcase's execution in the same place (run.log). The approach followed was to include the next statement

from pysys import log

and using the log object for writing traces from the additional components of our testing framework

class MyClass:
  def logSomething(self):
      log.info("Something to log")
...

But what I got is the duplication of the lines of the log in the following way:

2016-05-03 15:15:37,750 INFO  Test final outcome BLOCKED
INFO:pysys:Test final outcome BLOCKED
2016-05-03 15:15:37,750 INFO
INFO:pysys:
2016-05-03 15:15:37,851 CRIT
CRIT:pysys:
2016-05-03 15:15:37,851 CRIT  Test duration: 41.06 (secs)
CRIT:pysys:Test duration: 41.06 (secs)

I understand that I'm doing something not properly, so any feedback about that could be appreciated.

Thanks.