replicate = 5
with open("output_data" + str(replicate) + ".csv", "w") as out_file:
for i in range(len(fitness_list)):
out_string = ""
out_string += str(fitness_list[i])
out_string += "," + str(trait1_list[i])
out_string += "," + str(trait2_list[i])
out_string += "
"
out_file.write(out_string)