我收到错误消息：“UnsupportedOperation：读取”答案

【问题标题】：I am getting the error:"UnsupportedOperation: read"我收到错误消息：“UnsupportedOperation：读取”
【发布时间】：2020-07-14 07:07:41
【问题描述】：

import pickle

#writing into the file

f = open("essay1.txt","ab+")

list1 = ["Aditya","Arvind","Kunal","Naman","Samantha"]

list2 = ["17","23","12","14","34"]

zipfile = zip(list1,list2)

print(zipfile)

pickle.dump(zipfile,f)

f.close()

#opening the file to read it 

f = open("essay1","ab")

zipfile = pickle.load(f)

f.close()

输出是：

runfile('E:/Aditya Singh/Aditya Singh/untitled3.py', wdir='E:/Aditya Singh/Aditya Singh')
<zip object at 0x0000000008293BC8>
Traceback (most recent call last):

  File "E:\Aditya Singh\Aditya Singh\untitled3.py", line 21, in <module>
    zipfile = pickle.load(f)

UnsupportedOperation: read

【问题讨论】：

为什么要使用ab模式打开文件？
会不会是文件名有误？你写了essay1，但它看起来应该是essay1.txt。

标签： python pickle file-handling

【解决方案1】：

您在尝试打开文件的行中忘记了文件扩展名 .txt，并且您以 append 模式打开它，这就是返回的对象没有 read 或readline 方法（pickle.load 需要）。我还建议使用with keyword 而不是手动关闭文件。

import pickle

#writing into the file

with open("essay1.txt","ab+") as f:
    list1 = ["Aditya","Arvind","Kunal","Naman","Samantha"]
    list2 = ["17","23","12","14","34"]
    zipfile = zip(list1,list2)
    print(zipfile)
    pickle.dump(zipfile,f)

#opening the file to read it
with open("essay1.txt", "rb") as f:
    zipfile = pickle.load(f)

for item in zipfile:
    print(item)

输出：

<zip object at 0x7fa6cb30e3c0>
('Aditya', '17')
('Arvind', '23')
('Kunal', '12')
('Naman', '14')
('Samantha', '34')

【讨论】：

【解决方案2】：

你有essay1文件吗？还是essay1.txt？

这是试图在没有扩展的情况下打开。

f = open("essay1","ab")

所以无法读取。

【讨论】：

【解决方案3】：

您的代码有两个问题：

您打开文件是为了写入而不是读取。
您使用不同的文件名进行读取和写入。

这是一个可行的版本：

import pickle

#writing into the file
f = open("essay1.txt","wb")
list1 = ["Aditya","Arvind","Kunal","Naman","Samantha"]
list2 = ["17","23","12","14","34"]
zipfile = zip(list1,list2)
print(zipfile)
pickle.dump(zipfile,f)
f.close()

#opening the file to read it 

f = open("essay1.txt","rb")
zipfile = pickle.load(f)
print(zipfile)
f.close()

【讨论】：

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