python3的pickle保存pkl文件用python2打开出错

ValueError: unsupported pickle protocol: 3

出现该问题说明是在python2环境下想打开原本在python3下pickle保存的文件

解决这个问题的方式是：在原先python3环境下保存的时候改变pickle.dump()中protocol 参数为2

比如：

path  = './file.pkl'
with open(path,'wb') as f:
    pickle.dump(centers,f,protocol =2)

这样就可以在python2 环境下再打开，不报错：

path = './file.pkl'
    with open(path,'rb') as f:
        the_file = pickle.load(f)
    print(the_file)