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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 _get_footer_size(file_obj):
 """Read the footer size in bytes, which is serialized as little endian."""

    file_obj.seek(-8, 2)
    tup = struct.unpack(b"<i", file_obj.read(4))
    return tup[0]