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d�ZG dd� dej�Z ddedeej d dfdd�Z dded dfdd�Z dS )aH Logging support for Tornado.
Tornado uses three logger streams:
* ``tornado.access``: Per-request logging for Tornado's HTTP servers (and
potentially other servers in the future)
* ``tornado.application``: Logging of errors from application code (i.e.
uncaught exceptions from callbacks)
* ``tornado.general``: General-purpose logging, including any errors
or warnings from Tornado itself.
These streams may be configured independently using the standard library's
`logging` module. For example, you may wish to send ``tornado.access`` logs
to a separate file for analysis.
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`tornado.options.parse_command_line` or `tornado.options.parse_config_file`
(unless ``--logging=none`` is used).
Color support on Windows versions that do not support ANSI color codes is
enabled by use of the colorama__ library. Applications that wish to use
this must first initialize colorama with a call to ``colorama.init``.
See the colorama documentation for details.
__ https://pypi.python.org/pypi/colorama
.. versionchanged:: 4.5
Added support for ``colorama``. Changed the constructor
signature to be compatible with `logging.config.dictConfig`.
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:arg str datefmt: Datetime format.
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.. versionchanged:: 3.2
Added ``fmt`` and ``datefmt`` arguments.
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.. versionadded:: 4.2
This function existed in prior versions but was broken and undocumented until 4.2.
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