Question

I write this code:

f = open('example.txt','r')
lines = f.readlines()

for i, line in enumerate(f):
if i < 3:
   lines = ['LC '+line for line in lines]
   with open('./example.txt', 'w') as f:
      f.writelines(lines)
      f.close()
elif i < 5:
    lines = ['LB '+line for line in lines]
    with open('./example.txt', 'w') as f:
        f.writelines(lines)
        f.close()
elif i > 6:
    break

 f.close()

I have a file with 11 lines. I want to write something in the start from every line. The word is different for the 3 first line and different for other 2. Could you help me what am I doing wrong?

Answer 1

lines = [("LC" if i < 3 else "LB")+line for i,line in enumerate(lines)]

might do the trick