How to make a Python set case insensitive? [duplicate]

问题

This question already has answers here:

How to get Case Insensitive Python SET (6 answers)

How do I do a case-insensitive string comparison? (9 answers)

Closed 2 years ago.

I have the following script to import and export random TXT/CSV files from CLI, everything that passes has to be unique and case insensitive output in UTF-8, can I accomplish this with a set variable? I'm quite new to Python so every comment or suggestion is welcome!

This is my current script;

import hashlib
import sys


if len(sys.argv) < 3:
    print("Wrong parameter; script | inputfile | outputfile")
    sys.exit(1)

output_file_path = (sys.argv[2])
input_file_path = (sys.argv[1])

completed_lines_hash = set()

output_file = open(output_file_path, "w")

for line in open(input_file_path, "r")

  hashValue = hashlib.md5(line.rstrip().encode('utf-8')).hexdigest()

  if hashValue not in completed_lines_hash:
    output_file.write(line)
    completed_lines_hash.add(hashValue)

output_file.close()

来源：https://stackoverflow.com/questions/53780519/how-to-make-a-python-set-case-insensitive