读取文件中的所有图片的路径，保存到txt文件中。

import sys
import os.path

if __name__ == "__main__":

f = open('dataset.txt', 'w')
# 文件名，文件下还有多个类别的文件。
BASE_PATH="JAFFE"
SEPARATOR=";"
# 绝对路径地址
pth = "/Users/liupeng/Desktop/my/faceER/DataSet/"

for dirname, dirnames, filenames in os.walk(BASE_PATH):
for subdirname in dirnames:
label = subdirname
subject_path = os.path.join(dirname, subdirname)
for filename in os.listdir(subject_path):
abs_path = "%s/%s" % (subject_path, filename)
abs_path = pth + abs_path
print "%s%s%s" % (abs_path, SEPARATOR, label)
f.write("%s%s%s\n"%(abs_path, SEPARATOR, label))
f.close();