Python：ValueError：以10为底的int（）的无效文字：“”

Question

我正在创建代码以获取CSV文件中的平均分数。

CSV文件如下所示：

5 Ser15

4 Ser15

3 Ser15

第一列是分数，第二列是用户名。

到目前为止，这是我的代码：

   def av():
    with open("SciMedreport.csv","r") as f:
        average = 0
        Sum = 0
        row_count = 0
        for row in f:
            column = row.split(',')
            i=(int(column[0]))
            Sum += i
            row_count += 1
        average = Sum / row_count
        return 'The average is:', average
  av()

但是出现此错误...

  i=int(column[0])
ValueError: invalid literal for int() with base 10: '"'

当我打印整行进行检查时，将显示：

def av():
with open("SciMedreport.csv","r") as f:
    average = 0
    Sum = 0
    row_count = 0
    for row in f:
        print(row)
av()

结果如下：

5,Ser15
""

5,Ser15

""

4,Ser15

任何人都知道解决此问题的方法，或计算平均值的另一种方法？

Answer 1

当您尝试用'，'分割行时，因为没有，整个字符串将被返回并且尝试将其转换为int（）给您错误，请尝试使用''

Answer 2

我可以在代码中看到几个错误。

for row in f:
(1)    for column in row.split(','):
(2)            i=(int(column))
            Sum += i
        row_count += 1
(3)    average = Sum / len(column)

（1）拆分行时，您得到的基本上是一个数组/列表。 在您的情况下，它将为['5', 'Ser15] 。 而不是for循环，您可能想要更改代码，如下所示：

for row in f:
    columns_list = row.split(',')
    i=(int(columns_list[0]))
    Sum += i
    row_count += 1
average = Sum / row_count

（2）现在您无法将列表转换为整数。 您可能感兴趣的是i = int(column[0])即列表中的第一个数字，即CSV文件的第一列。

（3）您想找到所有行的平均值，对吗？ 它不是average = Sum / row_count吗？

def av():
    with open("SciMedreport.csv","r") as f:
        average = 0
        Sum = 0
        row_count = 0
        divisor = 0
        for row in f:
            row_count += 1
            if row_count%2 == 0: # if it doesn't work, try changing to 1
                # print(row.split(','))
                divisor += 1
                # write rest of the code here, Sum += i etc.
                columns_list = row.split(',')
                i = int(columns_list[0])
                Sum += i
        average = Sum / divisor

Answer 3

def av():
    with open("SciMedreport.csv","r") as f:
        average = 0
        Sum = 0
        row_count = 0
        divisor = 0
        for row in f:
            row_count += 1
            if row_count%2 == 0: # if it doesn't work, try changing to 1
                # print(row.split(','))
                divisor += 1
                # write rest of the code here, Sum += i etc.
                columns_list = row.split(',')
                i = int(columns_list[0])
                Sum += i
        average = Sum / divisor

谢谢user3903448！