用python3读取python2的pickle数据

问题一：TypeError: a bytes-like object is required, not 'str'

解决：该问题属于Python3和Python2的字符串兼容问题，数据文件是在Python2下序列化的，使用Python3读取时，需要将‘str’转化为'bytes'。

picklefile=open('XXX.pkl','r')

class StrToBytes:
    def __init__(self, fileobj):
        self.fileobj = fileobj
    def read(self, size):
        return self.fileobj.read(size).encode()
    def readline(self, size=-1):
        return self.fileobj.readline(size).encode()

data=pickle.load(StrToBytes(picklefile))

问题二：UnicodeDecodeError: 'ascii' codec can't decode byte 0x90 in position 44: ordinal not in range(128)

解决：加上encoding编码方式

pickle.load(StrToBytes(data_file),encoding='iso-8859-1')

附上完整的读取代码：

import pickle
class StrToBytes:
    def __init__(self, fileobj):
        self.fileobj = fileobj
    def read(self, size):
        return self.fileobj.read(size).encode()
    def readline(self, size=-1):
        return self.fileobj.readline(size).encode()

read = open('XXX.pkl', 'r')
data = pickle.load(StrToBytes(read),encoding='iso-8859-1')
    
print(data)