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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 tox_addoption(parser):
 """Add arguments and needed monkeypatches."""

    parser.add_argument(
        '--travis-after', dest='travis_after', action='store_true',
        help='Exit successfully after all Travis jobs complete successfully.')

    if 'TRAVIS' in os.environ:
        pypy_version_monkeypatch()
        subcommand_test_monkeypatch(tox_subcommand_test_post)