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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 usetz_now():
 """Determine current time depending on USE_TZ setting. Affects Django 1.4 and above only. if `USE_TZ = True`, then returns current time according to timezone, else returns current UTC time. """

    USE_TZ = getattr(settings, 'USE_TZ', False)
    if USE_TZ and DJANGO_VERSION >= '1.4':
        return now()
    else:
        return datetime.utcnow()