TypeError：“TypeError”对象没有特性“”__getitem__“”

Question

此代码是将csv文件读入多个列表的开始尝试。我得到了下面的错误，我看不出为什么浮点数没有被返回。谢谢你的帮忙!

 File "main.py", line 32, in <module>
     LR.openfile('djia_temp.csv')  
 File "main.py", line 9, in openfile
     self.xs = self.tempDiff(dataAvgandtemp)   
 File "main.py", line 18, in tempDiff
     tdArray.append([vector[0]-vector[1]]) 
 TypeError: 'float' object has no attribute '__getitem__'

代码：

from processFile import processFile
import numpy as np

class processFile:

    @staticmethod
    def wholeFile(f):
        fileArray = []
        for line in f:
            fileArray.append(line.strip())
        return fileArray

    @staticmethod
    def liner(rows, columns, delimiter):
        vectors = []
        for row in rows:
            vector = []
            tok = row.split(delimiter)
            for num in columns:
                vectors.append(float(tok[num]))
        return vectors

class linRegmain:
    def openfile(self, file):
        f = open(file)
        a = processFile.wholeFile(f)[1:]
        dataAvgandtemp = processFile.liner(a, [2,3], ";")
        self.xs = self.tempDiff(dataAvgandtemp)
        self.ys = processFile.liner(a,[1], ";")
        print self.xs
        print self.ys


    def tempDiff(self, vectors):
        tdArray = []
        for vector in vectors:
            tdArray.append([vector[0]-vector[1]])
        return tdArray

if __name__ == '__main__':
    LR = linRegmain()
    LR.openfile('djia_temp.csv')

Answer 1

liner()声称返回一个向量列表。事实并非如此。您正在创建一个float列表：

vectors.append(float(tok[num]))

因此，当您使用结果调用tempDiff()时，vector是一个float，因此vector[0]抛出一个异常。

我认为这就是它应该做的:将每个浮点数与当前向量相加，然后将向量添加到结果中：

@staticmethod
def liner(rows, columns, delimiter):
    vectors = []
    for row in rows:
        vector = []
        tok = row.split(delimiter)
        for num in columns:
            vector.append(float(tok[num])) # append to vector, not vectors
        vectors.append(vector)             # then append the vector to the result
    return vectors