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"""

These functions can be used for logging information.

.. Warning:: logger is not multiprocessing safe.

:version: 0.3

"""

import logging

import logging.handlers

def setUpLogger(log_filename, loggername='logger'):

    """

    Sets up a logger.

    :param: log_filename: name of the file to save the log.

    :param: loggername: name of the logger

    :return: logger instance

    """

    # create logger

    logger = logging.getLogger(loggername)

    logger.setLevel(logging.DEBUG)

    # Add the log message handler to the logger

    handler = logging.handlers.RotatingFileHandler(log_filename)

    # maxBytes=20, backupCount=5)

    # create formatter

    formatter = logging.Formatter(

        '%(asctime)s - %(module)s - %(funcName)s - %(levelname)s - %(message)s')

    # add formatter to ch

    handler.setFormatter(formatter)

    # add handler to logger

    if (logger.hasHandlers()):

        logger.handlers.clear()

    logger.addHandler(handler)

    return logger

# class SimpleLogger(object):

#     """

#     A simple class to create a log file or print the information on screen.

#     """

#     def __init__(self, filename, verbose=False):

#         self.file = open(filename, 'w')

#         self.verbose = verbose

#     def write(self, text):

#         """

#         Writes text either to file or screen.

#         """

#         print >> self.file, text

#         if self.verbose: print( text)