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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 file_segment(filename):
 """Return the data segment for a filename following T050017 Parameters --------- filename : `str`, :class:`~lal.utils.CacheEntry` the path name of a file Returns ------- segment : `~gwpy.segments.Segment` the ``[start, stop)`` GPS segment covered by the given file Notes ----- |LIGO-T050017|_ declares a filenaming convention that includes documenting the GPS start integer and integer duration of a file, see that document for more details. """

    from ..segments import Segment
    try:  # CacheEntry
        return Segment(filename.segment)
    except AttributeError:  # file path (str)
        return filename_metadata(filename)[2]