Pickle:UnicodeDecodeError: 'utf-8' codec can't decode byte 0x80 in position 0: invalid start byte

def grabTree(filename):
import pickle
fr = open(filename)
return pickle.load(fr)

出现

UnicodeDecodeError: 'utf-8' codec can't decode byte 0x80 in position 0: invalid start byte

解决方法：
把fw = open(filename,'w')改成了fw = open(filename,'wb')，所以在这个函数中也把fr = open(filename)改为fr = open(filename,'rb')，问题解决，似乎是版本问题