append a string to a modified line

[Mr_Blue]

hello,
thanks to both of you
would you care to explain the code?

1 2 3 4 5 6 7

if line.startswith("#EXTINF"): #this makes the loop target a certain line         out_text +=  line #i see this increments a variable previously set to ""         name = line.split(",", 1)[1] #i gather this splits line into some sort of array but i fail to grasp its use. #could you point me to somewhere this method is explained?         out_text += f'\n{name}.mp3\n' #at a loss. what's f?     else:         out_text += f"{line}\n"

just for the sake of precision, i think it could be good practice to close a file, i guess that print is just to check the whole thing and can be left along, it gives:

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

in_text = open("playlist.m3u", "r").read()    out_text = ""    for line in in_text.splitlines():     if line.startswith("#EXTINF"):         out_text +=  line         name = line.split(",", 1)[1]         out_text += f'\n{name}.mp3\n'     else:         out_text += f"{line}\n"            with open("new_playlist.m3u", "w") as f:     f.write(out_text) f.close()

is it no so?