def __init__(self, fmt=None, datefmt=None, style='%'):
"""
Initialize the formatter with specified format strings.
Initialize the formatter either with the specified format string, or a
default as described above. Allow for specialized date formatting with
the optional datefmt argument (if omitted, you get the ISO8601 format).
Use a style parameter of '%', '{' or '$' to specify that you want to
use one of %-formatting, :meth:`str.format` (``{}``) formatting or
:class:`string.Template` formatting in your format string.
.. versionchanged: 3.2
Added the ``style`` parameter.
"""
if style not in _STYLES:
raise ValueError('Style must be one of: %s' % ','.join(
_STYLES.keys()))
self._style = _STYLES[style](fmt)
self._fmt = self._style._fmt
self.datefmt = datefmt
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