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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 remove_nopairs(in_bam, out_dir, config):
 """Remove any reads without both pairs present in the file. """

    runner = broad.runner_from_config(config)
    out_bam = os.path.join(out_dir, "{}-safepair{}".format(*os.path.splitext(os.path.basename(in_bam))))
    if not utils.file_exists(out_bam):
        read_counts = collections.defaultdict(int)
        with pysam.Samfile(in_bam, "rb") as in_pysam:
            for read in in_pysam:
                if read.is_paired:
                    read_counts[read.qname] += 1
        with pysam.Samfile(in_bam, "rb") as in_pysam:
            with file_transaction(out_bam) as tx_out_bam:
                with pysam.Samfile(tx_out_bam, "wb", template=in_pysam) as out_pysam:
                    for read in in_pysam:
                        if read_counts[read.qname] == 2:
                            out_pysam.write(read)
    return runner.run_fn("picard_sort", out_bam, "queryname")