def init_work_dir(self):
retval = os.getcwd()
print '#current dir is : ' + retval
# ??????
store_dir = retval + os.sep + 'tmp'
print '#all imgs are going to be stored in dir :' + store_dir
if not os.path.exists(store_dir):
print '#tmp dir does not exist, attemp to mkdir'
os.mkdir(store_dir)
print '#mkdir sucessfully'
else:
print '#tmp dir is already exist'
self.store_dir = store_dir
# print '#now change current dir to tmp'
# os.chdir(store_dir) #no neccessary
# print os.getcwd()
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