TypeError：'float'對象沒有屬性'__getitem__'

Question

此代碼是將csv文件讀入幾個列表的開始嘗試。 我收到下面的錯誤，我不明白為什么浮動沒有返回。 謝謝你的幫助！

 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__'

碼：

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()聲稱返回一個向量列表。 它不是。 你正在制作一個float列表：

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

因此，當您使用結果調用tempDiff()時， vector是一個float ，因此vector[0]會拋出異常。

我認為這是它應該做的：將每個浮點數添加到當前向量，然后將向量添加到結果：

@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