for loop for length of list code example

Example 1: python for loop index

# Creates two variables; An index (num), and the value at that index (line)
for num, line in enumerate(lines):
    print("{0:03d}: {}".format(num, line))

Example 2: iterate array python with index

for header, rows in zip(headers, columns):
    print("{}: {}".format(header, ", ".join(rows)))