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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 hydra_to_vcf_writer(hydra_file, genome_2bit, options, out_handle):
 """Write hydra output as sorted VCF file. Requires loading the hydra file into memory to perform sorting on output VCF. Could generalize this to no sorting or by-chromosome approach if this proves too memory intensive. """

    _write_vcf_header(out_handle)
    brends = list(_get_vcf_breakends(hydra_file, genome_2bit, options))
    brends.sort(key=attrgetter("chrom", "pos"))
    for brend in brends:
        _write_vcf_breakend(brend, out_handle)