topics1 = ["MAR", "STA"]
topics2 = ["KST", "ABS", "KTR"]

accounts = []

for t in topics1:
    accounts += [t + "_" + str(i).zfill(2) + ";n.v.\n" for i in range(10)]
for t in topics2:
    accounts += [t + "_" + str(i).zfill(2) + ";n.v.\n" for i in range(100)]

with open("Kontenrahmen_Merkmale.csv", "w") as f:
    f.writelines(accounts)