python - I keep getting this error and I dont know hove to fix it -


i open file saying file not open. stuck on . new python.

here error:

traceback (most recent call last): file "\\users2\121721$\computer science\progamming\task3.py", line 43, in   <module> file.write(barcode + ":" + item + ":" + price + ":" +str(int((stocklevel-    float(howmany)))))     valueerror: i/o operation on closed file.

here code:

#open file in read mode file = open("data.txt","r") #read each line of data vairble filedata = file.readlines() #close file file.close()  total = 0 #create vairble total anotheritem = "y" # create while anotheritem == "y" or anotheritem  == "y" or  anotheritem ==  "yes" or  anotheritem ==  "yes" or  anotheritem ==  "yes":         print("please enter barcode")         usersitem=input()         line in  filedata:                 #split line in first , second section                 barcode = line.split(":")[0]                 item = line.split(":")[1]                 price = line.split(":")[2]                 stock = line.split(":")[3]                  if barcode==usersitem:                     file = open("data.txt","r")                     #read each line of data vairble                     filedata = file.readlines()                     #close file                     file.close()                     print(item +"       £" + str(float(price)/100) + "      stock: " + str(stock))                     print("how many want buy")                     howmany= input()                     total+=float(price) * float( howmany)                     line in  filedata:                         #split line in first , second section                         barcode = line.split(":")[0]                         item = line.split(":")[1]                         price = line.split(":")[2]                         stock = line.split(":")[3]                         if barcode!=usersitem:                             open("data.txt","w")                             file.write(barcode + ":" + item + ":" + price + ":" +stock)                             file.close()                         else:                             stocklevel=int(stock)                             open("data.txt","w")                             file.write(barcode + ":" + item + ":" + price + ":" +str(int((stocklevel-float(howmany)))))                             file.close()                     open("data.txt","w")                     stocklevel=int(stock)                     print("do want buy item? [yes/no]")                     anotheritem = input()         if anotheritem == "n" or "n" or "no" or "no" or "no":                 print("total price: £"+ str(total/100))

there 

if barcode!=usersitem:     open("data.txt","w")

you need 

if barcode!=usersitem:     file = open("data.txt","w")

also same error have in else statement.

and should consider refactoring code, because have lot of file openings , closings.

edit: @roganjosh mentioned file builtin name in python 2, you'd better change occurrences of file e.g. f.


-

Comments

Post a Comment

Popular posts from this blog

unity3d - Rotate an object to face an opposite direction -

i have object , b. when click on object b, rotates object b (a faces b). b doesn't face a. need following : when faces b, need face opposite direction. have code rotating @ b. how rotate face opposite direction after that? vector3 targetdirection = target - transform.position; float step = speed * time.deltatime; vector3 newdirection = vector3.rotatetowards (turretdome.transform.forward, targetdirection, step, 0.0f); turretdome.transform.rotation = quaternion.lookrotation (newdirection); you object facing object b, want inverse direction of object after that? objecta.transform.rotation = quaternion.inverse(objecta.transform.rotation) but lets assume example turretdome object a, (negate direction): turretdome.transform.rotation = quaternion.lookrotation (-newdirection); naturally, both of these snippets not show how smoothen rotation, seem know how use time.deltatime. just incase unsure, quaternion.lerp this
Read more

angular - Is it possible to get native element for formControl? -

i've got angular2 reactive form . created formcontrol s , assigned input fields by [formcontrol]=... . understand creates nativeelement <-> formcontrol link. my question: possible nativeelement formcontrol ? wanna myformcontrol.nativeelement.focus() i can share 1 terrible solution works me. in reactive forms can use either 1) formcontroldirective ts mycontrol = new formcontrol('') template <input type="text" [formcontrol]="mycontrol"> or 2) formcontrolname ts myform: formgroup; constructor(private fb: formbuilder) {} ngoninit() { this.myform = this.fb.group({ foo: '' }); } template <form [formgroup]="myform"> <input type="text" formcontrolname="foo"> </form> so these directives write patch like 1) formcontroldirective const originformcontrolngonchanges = formcontroldirective.prototype.ngonchanges; formcontroldirective.proto
Read more

javascript - Why jQuery Select box change event is now working? -

i working on product filters user select select box according his/her preference not getting selected value user in jquery. html code:- <select name="product_filter" id="product_filter"> <option value="price_low_first">price : low high</option> <option value="price_high_first">price : high low</option> <option value="latest">latest</option> <option value="popular">most popular</option> </select> jquery code: $(function () { $("#product_filter").change(function () { alert("hi") var selectedtext = $(this).find("option:selected").text(); var selectedvalue = $(this).val(); alert("selected text: " + selectedtext + " value: " + selectedvalue); }); }); hi believe code perfect. once please check jquery.min.js
Read more