我試圖編寫一個代碼來顯示每個項目的可用庫存（stock_level）。但是我收到了標(biāo)題中提到的錯誤。我將txt文件導(dǎo)入數(shù)組code,description,stock_level,min_stock,max_stock,buying_price,selling_price1,tukul,3,5,25,20.00,25.002,mouse,20,5,25,30.00,35.003,keyboard,2,5,25,30.00,35.004,headphone,20,5,25,100.00,105.005,monitor,1,5,25,150.00,155.006,cpu,20,5,25,700.00,705.007,casing,20,5,25,100.00,105.00到目前為止，這是我的代碼：import numpy as npimport csvlist = np.zeros((7,8),dtype = str)a = np.genfromtxt('stock.txt',delimiter = ',',dtype = str)#print(a)class stock:    def __init__(self, code, description, stock_level, min_stock, max_stock, buying_price, selling_price):        self.code = code        self.description = description        self.stock_level = stock_level        self.min_stock = min_stock        self.max_stock = max_stock        self.buying_price = buying_price        self.selling_price = selling_price    def sell(stock):        i = 0        while i < 7:            for r in a:                r = 1                for c in a:                    print(a[r][1]," have ", a[r][2]," of stocks")                    r += 1            i += 1disp = stock("","",0,0,0,0,0)disp.display()#disp.buy()#disp.buy()disp.sell()問題出在函數(shù) sell() 中這是我得到的輸出：tukul  have  3  of stocksmouse  have  20  of stockskeyboard  have  2  of stocksheadphone  have  20  of stocksmonitor  have  1  of stockscpu  have  20  of stockscasing  have  20  of stocksTraceback (most recent call last):  File "D:\OOP\Python\Kiosk\main.py", line 72, in <module>    disp.sell()  File "D:\OOP\Python\Kiosk\main.py", line 64, in sell    print(a[r+1][1]," have ", a[r+1][2]," of stocks")IndexError: index 8 is out of bounds for axis 0 with size 8>>我確實得到了我想要每個項目可用的庫存清單的結(jié)果。但我不知道是什么導(dǎo)致了錯誤