Question

我在python3中加载pickle文件时遇到问题。请参阅以下代码：

#!/usr/bin/env python3

import csv,operator
import pickle
import os.path

pathToBin = "foo/bar/foobar.bin"
pathToCSV = "foo/bar/foobar.csv" 

if os.path.isfile(pathToBin):
        print("Binary file already on harddrive, loading from there")
        transactions = pickle.loads( open( pathToBin, "rb" ))
else:
        csvIn = open(pathToCSV,'r')
        reader = csv.reader(csvIn)
        header = next(reader)
        header = header[0].split(";")

        print("Reading file")
        transactions = []
        for row in reader:
                # read file. 
        # transactions contains now lists of strings: transactions = [ ["a","b","c"], ["a2","b2","c3"], ...]
        print("Dumping python file to harddrive")
        myPickleFile = open(pathToBin,'wb')
        pickle.dump(transactions, myPickleFile, protocol=pickle.HIGHEST_PROTOCOL)

# do some more computation

保存文件没有任何问题。但是，加载它会给我以下错误：

transactions = pickle.loads( open( pathToBin, "rb" ))
TypeError: '_io.BufferedReader' does not support the buffer interface

由于我使用python3，因此字符串的处理方式不同。因此，我特意给出了“b”选项来保存/加载。任何人都知道为什么这不起作用？

Answer 1

您想使用transactions = pickle.load(open( pathToBin, "rb" ))：

loads

从您打开的文件句柄中读取。 bytes接受transactions = pickle.loads(open( pathToBin, "rb" ).read())而不是文件句柄（意思是：加载＆＃34;字符串＆＃34;，现在加载＆＃34;字节＆＃34;在python 3升级后对字符串/字节处理）：< / p>

with

从文件返回的字节读取。

在这种情况下，我会为你推荐第一个选项。第二种选择适用于更复杂的情况。

除此之外：最好使用with open( pathToBin,"rb") as f: transactions = pickle.load(f)上下文来控制文件何时关闭

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加载pickle文件时出错

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