无法将字符串转换为浮点数（熊猫）

Question

我想从 .csv 文件中读取数据行，每当我运行我的代码时，它都会弹出这个错误。我不知道如何解决这个问题。我查了一些类似的帖子，但仍然无法解决。

这是我的代码：

def getThreshold(dataSet, Attributes, isNumeric):
    '''
        Calculates median threshold from train dataset
    '''
    thresholds = []
    for x in Attributes:
        indx = Attributes.index(x)
        numeric = isNumeric[indx]
        if numeric:
            listAtt = []
            for row in dataSet:
                listAtt.append(float(row[indx]))     
            # calculate median a numeric attribute column
            median = statistics.median(listAtt)
            thresholds.append(median)
    return thresholds

这是我的示例数据，（不带引号）

41,management,single,secondary,no,764,no,no,cellular,12,jun,230,2,-1,0,unknown,no
39,blue-collar,married,secondary,no,49,yes,no,cellular,14,may,566,1,370,2,failure,no
60,retired,married,primary,no,0,no,no,telephone,30,jul,130,3,-1,0,unknown,no
31,entrepreneur,single,tertiary,no,247,yes,yes,unknown,2,jun,273,1,-1,0,unknown,no

发现问题的第一列是年龄，被标识为字符串。是csv文件的问题还是代码的问题？

Answer 1

如果不可能，将变量转换为浮点数会引发 ValueError。更改了您的代码以进行检查。

def getThreshold(dataSet, Attributes, isNumeric):
    '''
        Calculates median threshold from train dataset
    '''
    thresholds = []
    for x in Attributes:
        indx = Attributes.index(x)
        numeric = isNumeric[indx]
        if numeric:
            listAtt = []
            for row in dataSet:
                value = row[indx]
                # Try to convert value to float, if it fails then it keeps the original type
                try:
                    value = float(value)
                except ValueError:
                    pass
                listAtt.append(value)
            # calculate median a numeric attribute column
            median = statistics.median(listAtt)
            thresholds.append(median)
    return thresholds

附带说明： 所有变量都应以小写字母开头。 只有类定义应该以大写开头。