'str' object does not support item assignment python

Question

XP = 0
nmin = 50
nmax = 2000

        getxp = []
        f = open("users/" + user.name.lower() + ".txt", 'r')
        xpg = f.readline().split("X Points = ",1)[1]
        f.close


elif used_prefix and cmd == "dailychance" or "dc":
                if self.getAccess(user) >=1:
                    ngnum = str(random.randrange(nmin,nmax))
                    getxp
                    XP += ngnum
                    room.message("Old XP = " + xpg[0])
                    xpg[1] = XP
                    room.message("New XP = " + xpg[1])
                    f.writeline(xpg[1])
                    XP = 0
                else:
                    room.message("You are not Whitelisted. >=( ")

I want it to get a random number between those min and max and then assign the number to ngnum then add ngnum to XP then send a message Old Xp = The old value then change the value to the new one then send the message New XP = new value then rewrite the old value to the new one.

xpg is a string (xpg = f.readline().split("X Points = ",1)[1]) and strings are immutable in Python - therefore it fails on xpg[1] = XP. Can you show us what is the input (the file) and expected output? — freakish
– freakish, Commented Dec 5, 2013 at 7:35
It would help if your code was syntactically correct (e.g. indentation) and could be run. — aquavitae
– aquavitae, Commented Dec 5, 2013 at 7:45
input file = <First line> X Points = 0 <Second Line> Nickname = Xei — Xei
– Xei, Commented Dec 5, 2013 at 7:53
@freakish Output file = X points = <old value + new value> how can i make it work? and can you suggest any good python tutotials? — Xei
– Xei, Commented Dec 5, 2013 at 11:07

Tim Pietzcker · Accepted Answer · 2013-12-05 07:34:43Z

1

@freakish has figured out the problem that causes your error. But there are other problems, too:

if cmd == "dailychance" or "dc":

doesn't do what you think it does. It's equivalent to

if (cmd == "dailychance") or "dc":

and will therefore always evaluate to a true value.

Use

if cmd in ("dailychance", "dc"):

instead.

Also, you need to call the .close method: f.close() (note the parentheses).

answered Dec 5, 2013 at 7:34

Tim Pietzcker

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5 Comments

freakish Over a year ago

That's not true: xpg[1] = XP while xpg = f.readline().split("X Points = ",1)[1] is a string. That's the cause.

Tim Pietzcker Over a year ago

@freakish: Ah, there we are. See, that's why I wrote "that I can see". You should write this as an answer.

freakish Over a year ago

No problem. I could write it as answer, however I would also like to know what exactly he is trying to achieve (i.e. input and output) so perhaps there's a better way to do it. The code is messy.

Tim Pietzcker Over a year ago

That's certainly true :)

Xei Over a year ago

trying to achieve output as New Xp = the value of xpg + the value of ngnum and it would write it in the file

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