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# Module: `core.logger`

Logger class for IPython’s logging facilities.

## 1 Class

class `IPython.core.logger.``Logger`(home_dir, logfname='Logger.log', loghead=u'', logmode='over')

  Bases: `object`

  A Logfile class with different policies for file creation

  `__init__`(home_dir, logfname='Logger.log', loghead=u'', logmode='over')
  `close_log`()

    Fully stop logging and close log file.

    In order to start logging again, a new logstart() call needs to be made, possibly (though not necessarily) with a new filename, mode and other options.

  `log`(line_mod, line_ori)

    Write the sources to a log.

    Inputs:

    - line_mod: possibly modified input, such as the transformations made by input prefilters or input handlers of various kinds. This should always be valid Python.
    - line_ori: unmodified input line from the user. This is not necessarily valid Python.
  `log_write`(data, kind='input')

    Write data to the log file, if active

  `logstart`(logfname=None, loghead=None, logmode=None, log_output=False, timestamp=False, log_raw_input=False)

    Generate a new log-file with a default header.

    Raises RuntimeError if the log has already been started

  `logstate`()

    Print a status message about the logger.

  `logstop`()

    Fully stop logging and close log file.

    In order to start logging again, a new logstart() call needs to be made, possibly (though not necessarily) with a new filename, mode and other options.

  `switch_log`(val)

    Switch logging on/off. val should be ONLY a boolean.

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