Blender retargeting script (ugly version)

import bpy

bpy.ops.object.mode_set(mode='POSE', toggle=False)
bpy.ops.pose.select_all(action="SELECT")
selbones = bpy.context.selected_pose_bones

targetrig = bpy.data.objects["root"]

ignore = ("CS_thigh","CS_calf", "CS_upperarm","CS_lowerarm","CS_LegPoletarget","CS_ElboRoll","CS_foot_l","CS_foot_r","CS_FootRoolMain","CS_hand_l","CS_hand_r","CS_thumb_all","CS_middle_All","CS_index_all","CS_pinky_All","CS_ring_All")

retarget = True
#retarget = False

if retarget == True:   
    for bone in selbones:
        abort = 0
        for thing in ignore:
            if bone.name.startswith(thing) == True:
                abort = 1
        splitname = bone.name.split("_")
        if len(splitname) == 4:
            if splitname[1] == "ik":
                fixedname = splitname[2] + "_" + splitname[3]
                abort = 2
            else:
                fixedname = splitname[1] + "_" + splitname[2] + "_" + splitname[3]
        if len(splitname) == 3:
            if splitname[1] == "FootMainIK":
                fixedname = "foot" + "_" + splitname[2].lower()
                abort = 2
            else:
                fixedname = splitname[1] + "_" + splitname[2]
        if len(splitname) == 2:
            if splitname[1] == "neck":
                fixedname = "neck_01"
            else:
                fixedname = splitname[1]
        if len(splitname) == 1:
                fixedname = splitname[0]
        if fixedname == "root":
            print("root")
        else:
            if abort == 1:
                continue
            if abort == 2:
                nc = bone.constraints.new(type='CHILD_OF')
                nc.influence = 1
                nc.target = targetrig
                nc.subtarget = fixedname
                nc.owner_space = "WORLD"
                nc.target_space = "WORLD"
                context_copy = bpy.context.copy()
                context_copy["constraint"] = bone.constraints["Child Of"]
                bpy.context.active_object.data.bones.active = bone.bone
                bpy.ops.constraint.childof_set_inverse(context_copy, constraint="Child Of", owner='BONE') # set inverse - resets the root bone to original location
            
            else:
                nc = bone.constraints.new(type='COPY_TRANSFORMS')
                nc.influence = 1
                nc.target = targetrig
                nc.subtarget = fixedname
                nc.owner_space = "WORLD"
                nc.target_space = "WORLD"
                
else:
    for bone in selbones:
        for constraint in bone.constraints:
            if constraint.type == "CHILD_OF" or constraint.type == "COPY_TRANSFORMS":
                bone.constraints.remove(constraint)