python remove duplicate lines from text file code example

Example 1: txt file duplicate line remover python

lines_seen = set() # holds lines already seen

with open("file.txt", "r+") as f:
    d = f.readlines()
    f.seek(0)
    for i in d:
        if i not in lines_seen:
            f.write(i)
            lines_seen.add(i)
    f.truncate()

Example 2: python delete duplicate lines in file

with open("file.txt", "r") as txt_file:
  new_data = list(set(txt_file))
  return new_data