Question

我正在尝试建立银行，但我无法更改文件的整数数据。我的文件包含：

astle,hello,11

monish,mr7,0

现在在我的＆＃39; choice1＆＃39;（稍后在代码中显示）当我尝试存款时假设为100，它不会更改值而是给出相同的值。就像我输入我的情况一样用户名为＆＃39; astle＆＃39;并尝试存入100，价值变为100而不是111.我想要111存入它应该是旧值+ newvalue。
我尝试了以下代码，但无济于事。

这是我的代码：

import csv
run=True
while run==True:
    print "1) Deposit money"
    choice=input("Enter your choice over here: ")
    #This part takes the input from the user and then stores it in 'store.txt'
    if choice==1:
        b=raw_input("Enter the username: " )
        with open('store.txt','r') as f:
            reader = list(csv.reader(f))
            for row in reader:
                if b==row[0]: #Check the username with the file
                    c=input("Enter your new ammount")
                    print row[2],"Old value"
                    a=int(row[2])
                    print a
                    row[2] = c
                    print row[2],"New value"
                    flag = 1 
                    break
                else:
                    flag=0
        if flag==0:
            print "Username does not exist."

        #Writes the new value in the file
        with open('store.txt','w') as f:
            wr = csv.writer(f)
            for row in reader:
                wr.writerow(row)

我尝试用行[2] + = c替换row [2] = c，但它给出了以下错误：

 row[2]+=d
TypeError: cannot concatenate 'str' and 'int' objects

Answer 1

您需要将值从str转换为int。试试这个。

row[2] = str(int(row[2]) + c)

如何在CSV中操作整数数据？

1 个答案: