my csv file:
id;Remarks;x;y;z
a1;Mv_biw;10;12;3
b1;Ins_slt_po_zd;20;22;5
a2;Mv_biw;25;17;7
a1;Ins_slt_po_zd;35;13;3
a1;Ins_slt_dkz;15;19;9
b1;Mv_biw;65;11;2
b2;Ins_slt_dkz;50;23;1
b2;Mv_biw;75;17;7

my code sofar:
import os
import csv
import collections
from csv import DictWriter

with open(r'C:UsersrphDesktopkar_csv_testworkfilesinternetnewincsv_new.csv', 'r') as csvfile:
    reader = csv.reader(csvfile, delimiter=';')
    my_dict = collections.defaultdict(dict)
    for row in reader:
        my_dict[row[0]][row[1]] = [row[2],row[3],row[4]]

print (my_dict)


with open(r'C:UsersrphDesktopkar_csv_testworkfilesinternetnewoutcsv_new.csv','w', newline='') as wf:
    fieldnames = ['ID','x_Mv_biw', 'y_Mv_biw', 'z_Mv_biw', 'x_Ins_slt_po_zd', 'y_Ins_slt_po_zd', 'z_Ins_slt_po_zd', 'x_Slb_po_zd', 'y_Slb_po_zd', 'z_Slb_po_zd', 'x_Slb_dkz', 'y_Slb_dkz', 'z_Slb_dkz', 'x_Ins_slt_dkz', 'y_Ins_slt_dkz', 'z_Ins_slt_dkz']
    my_write = csv.DictWriter(wf, fieldnames = fieldnames, delimiter = ';')
    my_write.writeheader()

desired output csvfile:
id;x_Mv_biw;y_Mv_biw;z_Mv_biw;x_Ins_slt_po_zd;y_Ins_slt_po_zd;z_Ins_slt_po_zd;z_Ins_slt_po_zd;x_Slb_po_zd;y_Slb_po_zd;z_Slb_po_zd;x_Slb_dkz;y_Slb_dkz;z_Slb_dkz;x_Ins_slt_dkz;y_Ins_slt_dkz;z_Ins_slt_dkz
a1;10;12;3;35;13;3;;;;;;;;15;19;9
a2;25;17;7;;;;;;;;;;;;;
b1;65;11;2;20;22;5;;;;;;;;;;
b2;75;17;7;;;;;;;;;;;50;23;1