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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 get_requirements(filename=None):
 """ Read requirements from 'requirements txt' :return: requirements :rtype: list """

    if filename is None:
        filename = 'requirements.txt'

    file = WORK_DIR / filename

    install_reqs = parse_requirements(str(file), session='hack')
    return [str(ir.req) for ir in install_reqs]