files = {1: "file1.txt", 2: "file2.txt", 3: "file3.txt", 4: "file4.txt", 5: "file5.txt"}

for data_line in data_clustered:
    file_id = kazkaip_gaut_clusteri(data_line)
    file = files[file_id]
    with open(file,"a") as f:
        f.write(data_line)