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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def add_options(cls, parser):
 """Add options to flake8. :param parser: optparse.OptionParser from pycodestyle. """

        parser.add_option('--show-pydocstyle', action='store_true', help='show explanation of each PEP 257 error')
        parser.config_options.append('show-pydocstyle')