Replace the tuple list with a string

infile1 = open("a1.txt", "r")

tuple_data = []
title_line = None
idx = 0
while True:
    line = infile1.readline()
    if not line:
        break
    else:
        line = line.replace("\n", "")
        line = line.split(',')
        tuple_data.append(line)

        won = int(tuple_data[idx][1])
        lost = int(tuple_data[idx][2])

        # Find the percentage
        tuple_data[idx].append(round(won / (won + lost), 3))

        idx += 1

print(tuple_data)

infile1.close()

# Sort
tuple_data.sort(key=lambda x: x[3])

print("List in Tuple-------")
print(tuple_data)

# Replace the data divided by split() with a string
idx = 0
for idx in range(len(tuple_data)):
    tuple_data[idx] = '\t'.join(tuple_data[idx])

print("String in Tuple-------")
print(tuple_data)

# Write Results
infile2 = open("a2.txt", "w")

# Title line
title_line = "Team\tWon\tLost\trate\n"
infile2.write(title_line)

# Write Sort Data
idx = 0
for idx in range(len(tuple_data)):
    infile2.write(tuple_data[idx])

infile2.close()