Python：IndexError：列表索引变形

Question

当我使用我之前的一组数据时，这段代码运行良好。但是，现在我向输入数据集添加了更多列，并且出现索引错误。我不确定如何解决这个问题。任何输入？ .以下代码给了我错误：

with open("master_aggregated_monthly.csv", 'rb') as csvfile:
    data_reader = csv.reader(csvfile, delimiter = ',', quotechar = '"')
    rolling_queue = []
    for row in data_reader:
        if row[0].lower() == "salesforceid":
            continue

        # most recent rows go in first
        rolling_queue.insert(0,row)
        if len(rolling_queue) > 12:
            rolling_queue.pop()

        id = row[0]
        date = row[2]
        if id in company_dictionary:
            account = company_dictionary[id]
            #See if we are at the final event
            #get the final event from the list
            # most recent date for data collection
            if date == "6/1/2016":
                new_event = event()
                new_event.date = "7/1/2016"
                new_event.type = "Current Period"
                account.events.append(new_event)
                my_event = account.events[0]
                for entry in rolling_queue:
                # don't do anything if the entry in the rolling queue is not from the same account
                    if entry[0] != id:
                        continue

                    nonzero_row = False
                    # loop through the entries in the rolling queue to find at most the last 12 months of data
                    for i in range(3, len(entry)):
                        try:
                            my_event.attributes[i-3] += float(entry[i])
                        except:
                            #handle all of the odd string things
                            temp = entry[i].split(' ')
                            if temp[0] == '':
                                temp = float(temp[1])
                            else:
                                temp = float(temp[0])
                            my_event.attributes[i-3] += temp
                        # discover if this row is nonzero
                        if entry[i] != 0 and entry[i] != '0':
                            nonzero_row = True
                    # don't include this rown in the average if it's a zero row
                    if nonzero_row:
                        #print "Month increment"
                        my_event.months += 1

这段代码给了我以下错误

<type 'exceptions.IndexError'>
Traceback (most recent call last):
  File "P:/Testing/The Scripts, JIC Test/Q4_12month.py", line 116, in main
    my_event.attributes[i-3] += temp
IndexError: list index out of range

Answer 1

您正在根据entry 的长度创建索引，但在my_event.attributes 中使用该索引：

for i in range(3, len(entry)):
    ...
    except:
        ...
        my_event.attributes[i-3] += temp
        ...
    ...

这可能是问题所在，但很难判断您的代码在做什么。通常，您只想在创建索引时使用的任何对象/索引应该引用的任何对象上使用索引（在本例中为 entry）。