Psycopg2執行元組索引超出範圍

我對python非常陌生，這是我的第一個編程語言。這是我第一次使用SQL以及psycopg2。任何「愚蠢」的建議非常感謝！Psycopg2執行元組索引超出範圍

我不確定是什麼問題。我的研究告訴我，我只是給cursor.execute(INSERT...提供了太多或太多的論據，但我已經嘗試了許多不同的計數，並且似乎無法正確工作。從我的角度來看，cursor.execute(CREATE...創建了一個有6列的表格，我正在向它傳遞6個參數。

from lxml import html # Used to parse XML 
import requests #used to service API request 

itemtypeid1 = 34 
itemtypeid2 = 35 
regionid = 10000002 

webpage = requests.get('http://api.eve-central.com/api/marketstat?typeid=%i&typeid=%i&regionlimit=%i' % (
itemtypeid1, itemtypeid2, regionid)) 

if webpage.status_code == 200: 
    data = html.fromstring(webpage.content) 
    for item in data.iter('type'): 


     buy_dict = {node.tag: node.text for node in item.xpath("buy/*")} 
     sell_dict = {node.tag: node.text for node in item.xpath("sell/*")} 

     #Variables for output 
     itemid = (item.get("id")) 
     buymin = buy_dict['min'] 
     buymax = buy_dict['max'] 
     buymedian = buy_dict['median'] 
     buyvolume = buy_dict['volume'] 
     buyaverage = buy_dict['avg'] 

#Fail if api webpage unavaliable 
else: 
     print "Webpage unavaliable" 
     Webpage.raise_for_status() 


############################################################################# 


import psycopg2 

connection = psycopg2.connect(database='evemarketdata', user='postgres', password='black3car') 

#open a cursor to perform DB operations 
cursor = connection.cursor() 

#create new table 
cursor.execute("CREATE TABLE arkonor (itemid integer primary key, min integer, max integer, median integer, volume integer, average integer);") 

#Insert row data into DB table 
cursor.execute("""INSERT INTO arkonor (typeid, min, max, median, volume, average) 
    VALUES (%s, %s, %s, %s, %s, %s, %s, %s)""", 
    ('itemid', 'buymin', 'buymax', 'buymedian', 'buyvolume', 'buyaverage')) 


#Commits all changes does with cursor 
#connection.commit()

結果

Traceback (most recent call last): 

File "E:\Eve Spreadsheets\Python\PostgreConnect.py", line 49, in <module> 

('itemid', 'buymin', 'buymax', 'buymedian', 'buyvolume', 'buyaverage')) 

IndexError: tuple index out of range

來源

2016-08-24 Greg Perry

只是經過並想提醒你：在「INSERT」的執行語句中，實際上是將6個字符串傳遞給查詢。您需要傳遞變量的值（即不帶引號） – Flickerlight

您在查詢8個參數，但在元組只提供了6場。代碼應該是：

#Insert row data into DB table 
cursor.execute("""INSERT INTO arkonor (typeid, min, max, median, volume, average) 
    VALUES (%s, %s, %s, %s, %s, %s)""", 
    ('itemid', 'buymin', 'buymax', 'buymedian', 'buyvolume', 'buyaverage'))

來源

2016-08-24 03:11:53 max

Psycopg2執行元組索引超出範圍

回答

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