将文件附加到列表时出错 - IndexError：列表索引超出范围

Question

我一直在尝试将图片附加到＆＃39;样本＆＃39;列表但所有文件都附加在样本[0]中。文件夹中总共有72个图像文件。在打印样本[1]时，IDE显示上述错误。这是我的代码 -

samples = []
files = glob.glob('Path_to_folder/*.png')
#print len(files)  //prints 72


for myfile in files:

    img = misc.imread(myfile)

    img=(img[::2, ::2]/255.0).reshape(-1)

    #print img  //prints 72 rows with values like these - [ 0.01568627  0.01568627  0.01176471 ...,  0.05098039  0.05098039  0.04705882]

    samples.append(img)

    #print samples[1]    //prints IndexError: ;list index out of range. While samples[0] prints all the files.

    samples = pd.DataFrame(samples)