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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 _read_tRNA_scan(summary_file):
 """ Parse output from tRNA_Scan """

    score = 0
    if os.path.getsize(summary_file) == 0:
        return 0
    with open(summary_file) as in_handle:
        # header = in_handle.next().strip().split()
        for line in in_handle:
            if not line.startswith("--"):
                pre = line.strip().split()
                score = pre[-1]
    return score