[Tutor] Newbie append puzzle
Janssen at rz.uni-frankfurt.de
Sun Nov 2 10:27:50 EST 2003
On Sun, 2 Nov 2003, Tim Ronning wrote:
> BTW. My Opera mail reader/writer is messing up indentation somehow.
[you got probably a tab-problem. code below mixes tabs and spaces]
> Let's try this.
> elif choice == '3':
> def append(mp3):
> app = open("playlist","a")
> newmp3 = raw_input("New mp3: ")
> elif choice == '4':
> def makeaList(s):
> anothermp3 = string.split(s)
> return anothermp3
> playlist = open("playlist","r")
> mp3list = 
> for line in playlist.readlines():
> mp3list = mp3list + makeaList(line)
> delnr = int(raw_input("Which number? "))
> del mp3list[delnr]
> listlen = len(mp3list)
> def append(mp3):
> app = open("playlist.new","a")
> n = 0
> while n < listlen:
> n = n + 1
> The problem: The append() function under choice "3" appends the raw_input
> on a new line in the playlist file. Simple ascii. This is correct. The
> append() function under choice "4" appends all the list items on one single
> line without spaces,
certainly choice "4" "mp3" strings manage somehow to get rid of their
newlines. The newline was originally delivered by "raw_input". Hint:
string.split splits per default by any kind of whitespace....
Best (instead of making shure that your code never tries to "append" a
string, that doesn't end in newline) is to rewrite your "append"
function, so that it test itself if the "mp3" string ends with a
newline. I assume, you want to write that bit yourself (Feel free to
ask on tutor if you can't get it right - or post your solution)?
Note: now where you need to enhance your "append" function it becomes
even more sensible to define it only once: Just define it before any
if-clause and you won't have to do every bugfix twice.
Hey, welcome at tutor and python :-)
> this is not what I want. I want them on separate
> lines. I have a feeling the answer is embarasing simple and probably
> steering me right in the face, but somehow I don't see it. Anyone?
> Best regards
> Tim Ronning
> Tutor maillist - Tutor at python.org
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