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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 format_duration(secs):
 """ Format a duration in seconds as minutes and seconds. """

    secs = int(secs)

    if abs(secs) > 60:
        mins = abs(secs) / 60
        secs = abs(secs) - (mins * 60)

        return '%s%im %02is' % ('-' if secs < 0 else '', mins, secs)

    return '%is' % secs