[Python] finding the complete path of an image

C:\Users\siva\Downloads\ASL-Finger-Spelling-Recognition-master\asl_dataset\1


like the above path there will be several images 0-9 and a-z hence there are 36 classes. In the above path the last one indicates the number 1. In the below program i have to find that one by traversing it but it ended up with

ASL-Finger-Spelling-Recognition-master producing a key error at y_train.append(classes[fullpath[n + 1:t]]) because classes[ASL-Finger-Spelling-Recognition-master] does not exists.
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def load_data_set():
for path in paths:
for root, directories, filenames in os.walk(path):
for filename in filenames:
if filename.endswith(".jpeg"):
fullpath = os.path.join(root, filename)
img = load_img(fullpath)
img = img_to_array(img)
print fullpath
x_train.append(img)
t = fullpath.rindex("/")
fullpath = fullpath[0:t]
n = fullpath.rindex("/")
#print fullpath[n + 1:t]
y_train.append(classes[fullpath[n + 1:t]])

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