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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 utcnow():
 """Overridable version of utils.utcnow."""

    if utcnow.override_time:
        try:
            return utcnow.override_time.pop(0)
        except AttributeError:
            return utcnow.override_time
    return datetime.datetime.utcnow()