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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 _defaults():
 """Returns a dict of default args from the environment, which can be overridden by command line args. """

    d = {}
    d['url'] = os.environ.get('BUGZSCOUT_URL')
    d['user'] = os.environ.get('BUGZSCOUT_USER')
    d['project'] = os.environ.get('BUGZSCOUT_PROJECT')
    d['area'] = os.environ.get('BUGZSCOUT_AREA')
    return d