python - Deleting a line from a text file

Question

How to you delete a specific line from a text file using readlines()

like:

f_open = open("textfile.txt", "r")
lines = f_open.readlines()

How do you use lines to choose a line in textfile.txt and delete it?

Sorry if it doesn't make sense.

Answer 1

Use the fileinput module's inplace functionality. Refer Optional in-place filtering section at fileinput. The example below deletes the first line from a file:

import fileinput
import sys

for line_number, line in enumerate(fileinput.input('myFile', inplace=1)):
  if line_number == 0:
    continue
  else:
    sys.stdout.write(line)