Fix my Code For Pandas-Python

Hello, so I am building a simple app here I wanted some values in my CSV to be updated in a 15 minutes, I wanted this app to run on background. However I couldn't get it to work the way I want to. I wanted it to run on background while I am seeing the landing page of my app. which is index HTML Here's what I tried out: I'm using the pandas, sched and time imports here: #INTERFACE @[login to view URL]("/") def home(): s = [login to view URL]([login to view URL], [login to view URL]) [login to view URL](15, 1, timer) [login to view URL]() return render_template("[login to view URL]") #TIMER def timer(): timer = 0 csv_file='C:\Python27\Walmart\[login to view URL]' print("UPDATING") data_df = pd.read_csv(csv_file) print("READ") for i, row in [login to view URL]() : sku = [login to view URL][i]['Walmart SKU'] print (sku) if sku is '': break else: update(sku) print("Item Updated") print("UPDATECOMPLETE") home() #UPDATE def update(sku): lookup=str(sku) lookup = [login to view URL]('.0', '') product = wapy.product_lookup(lookup) ts = [login to view URL]() st = [login to view URL]().strftime('%Y-%m-%d %I:%M %p') print ([login to view URL]) if product.available_online is 'TRUE': instock = 'yes' else: instock ='no' quote_page = product.product_url page = urlopen(quote_page) soup = BeautifulSoup(page, '[login to view URL]') sold_box = [login to view URL]('a', attrs={'class': 'font-bold prod-SoldShipByMsg'}) sold = [login to view URL]() left_box = [login to view URL]('div', attrs={'class': 'prod-ProductOffer-urgencyMsg'}) left = [login to view URL]() if left is '': stock=[login to view URL] else: stock=left # fields=[lookup + ',' + '$'+str(product.sale_price) + ',' + instock + ',' + stock + ',' + str(sold) + ',' + st + ',' + '$'+str([login to view URL])] pathto_csv = 'C:\Python27\Walmart\[login to view URL]' data_df = pd.read_csv(pathto_csv) print("CSV READ") data_df.set_value([lookup], ['Price'], '$'+str(product.sale_price)) data_df.set_value([lookup], ['In Stock'], instock ) data_df.set_value([lookup], ['Quantity'], stock) data_df.set_value([lookup], ['Last Update'], str(sold)) data_df.set_value([lookup], ['Min Price'], '$'+str([login to view URL])) data_df.to_csv(pathto_csv) with open(r'[login to view URL]', 'a') as f: writer = [login to view URL](f, delimiter=' ', quotechar = ' ') [login to view URL](fields) print(st) print("UPDATED! 15 Minutes Have Passed!") To make it short I have two problems here that I can't solve 1. On replacing the value on my update I'm getting this error: KeyError: "['879091509'] not in index" I am asuming here that [row],[column], would let me replace the value I want for that cell, for example" data_df.set_value([lookup], ['Price'], '$'+str(product.sale_price)) I am reading this as, on row of where my SKU or ID is represented by ['lookup'], I will replace the ['Price'] by '$'+str(product.sale_price) 2. I can't get to my interface, because i think when the time resets it runs the code again. How can I make this run only in background? It's just fixing a code.