python 出现KeyError: [Open] not in index

#!/usr/bin/env python
# -*-coding: UTF-8 -*-

import numpy as np

import matplotlib.pyplot as plt

import pandas as pd

import os



directory = 'C:\\python\\mp'

filenames = os.listdir(directory)

print(filenames)



all_data = np.zeros((len(filenames),1056),dtype = np.float32)

for i in range(len(filenames)):

  filename = filenames[i]

  print(i)

  print(filename)

  

  data=pd.read_csv(directory+'/'+filename)

  vars = ['Open']

  data = data[vars]

  data = np.array(data)

  data = np.transpose(data)

  data = data[0]

  data = data[::-1]

  

  all_data[i] = data



print(all_data.shape)  

np.save('data',all_data)

运行了这段代码最后出现这种情况



新手刚刚学python！在网上查了好几天的资料了，都没有找到解决的方法，所以才来问问各位大神，该如何解决这个问题