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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 _fill_prioritization_targets(data):
 """Fill in globally installed files for prioritization. """

    ref_file = dd.get_ref_file(data)
    for target in ["svprioritize", "coverage"]:
        val = tz.get_in(["config", "algorithm", target], data)
        if val and not os.path.exists(val) and not objectstore.is_remote(val):
            installed_vals = []
            # Check prioritize directory
            for ext in [".bed", ".bed.gz"]:
                installed_vals += glob.glob(os.path.normpath(os.path.join(os.path.dirname(ref_file), os.pardir,
                                                                          "coverage", "prioritize",
                                                                          val + "*%s" % ext)))
            # Check sv-annotation directory for prioritize gene name lists
            if target == "svprioritize":
                simple_sv_bin = utils.which("simple_sv_annotation.py")
                if simple_sv_bin:
                    installed_vals += glob.glob(os.path.join(os.path.dirname(os.path.realpath(simple_sv_bin)),
                                                             "%s*" % os.path.basename(val)))
            if len(installed_vals) == 0:
                # some targets can be filled in later
                if target not in set(["coverage"]):
                    raise ValueError("Configuration problem. BED file not found for %s: %s" %
                                     (target, val))
                else:
                    installed_val = val
            elif len(installed_vals) == 1:
                installed_val = installed_vals[0]
            else:
                # check for partial matches
                installed_val = None
                for v in installed_vals:
                    if v.endswith(val + ".bed.gz") or v.endswith(val + ".bed"):
                        installed_val = v
                        break
                # handle date-stamped inputs
                if not installed_val:
                    installed_val = sorted(installed_vals, reverse=True)[0]
            data = tz.update_in(data, ["config", "algorithm", target], lambda x: installed_val)
    return data