os

获得当前工作目录

os.getcwd()

切换目录

os.chdir('../123')

pickle

保存数据

pickle.dump(要保存的数据，目标文件)

import pickle
try:
    with open('test1.txt','wb') as test1, open('test2.txt','wb') as test2:
        pickle.dump('new world',test1)
        pickle.dump('old world',test2)
except IOError as ierr:
    print("File Error:"+str(ierr))
except pickle.PickleError as perr:
    print("Picking Error:"+str(perr))

恢复数据

pickle.load(目标文件)

try:
    with open('test1.txt','rb') as test1, open('test2.txt','rb') as test2:
        n_test1 = pickle.load(test1)
except IOError as ierr:
    print("File Error:"+str(ierr))
except pickle.PickleError as perr:
    print("Picking Error:"+str(perr))

    
>>> n_test1
'new world'