def my_mp4_playlist(file_path, new_song):

	open_file = open(file_path, "r")
	text = open_file.read()
	list = text.split("\n")
	open_file.close()
	change_text = open(file_path, "w")
	length = len(list)
	count = 0

	if length >= 3:

		for letter in list[2]:
			if letter == ";":
				break
			count += 1
		list[2] = new_song + list[2][count::]
		string = "\n".join(list)
		change_text.write(string)
		change_text.close()
		print(string)
	else:
		i = length
		while i < 3:
			list.append("")
			i += 1

		for letter in list[2]:
			if letter == ";":
				break
			count += 1
		list[2] = new_song + list[2][count::]

		string = "\n".join(list)
		change_text.write(string)
		change_text.close()
		print(string)


my_mp4_playlist(r"C:\New folder\a.txt", "gay")