Question

我当前正在编写一个代码，询问用户是否要复制文件的内容并将其放入另一个文件，还比较文件的两个内容以查看它们是否相同。我文件的复制部分有效，但比较两个文件内容的部分无效。我收到一条错误消息：

line2 = output_file.readlines（）
io.UnsupportedOperation：不可读

这是我目前的代码：

userinput=int(input('Press 1 to copy files, 2 to compare files, anything else to stop')) #prompt user for comparing or copying
while userinput==1 or userinput==2:
    if userinput==1:
        with open(input('Enter file you want copied:')) as input_file:
            with open(input('Enter file you want contents copied to:'), 'w') as output_file:
                    for line in input_file:     #contents of first file copied to second file
                        output_file.write(line)
        userinput=int(input('Press 1 to copy files, 2 to compare files, anything else to stop'))
    elif userinput==2:
        with open(input('Enter file you want to check')) as input_file:
            with open(input('Enter second file you want to check:'), 'w') as output_file:
                line1=input_file.readlines() #reads each line of the text
                line2=output_file.readlines()
                if line1==line2:        #checks if text is identical to each other
                    print('files are identical')
                    userinput=int(input('Press 1 to copy files, 2 to compare files, anything else to stop'))
                elif line1 != line2:
                    print('This is where the file deviates')
                    print(line1)
                    print(line2)
                    userinput=int(input('Press 1 to copy files, 2 to compare files, anything else to stop'))

该如何解决？

Answer 1

您已打开输出文件<FormGroup row> <Col md={6}> <Select placeholder={label} name={fieldName} onChange={method1} options={options} display="none" /> </Col> </FormGroup>进行写入（file = input("Enter the file name: ") text_file = open(file, "r") lines = text_file.readlines() print (len(lines)) while True: linenumber = int(input("Please enter a line number or press 0 to quit: ")) if linenumber == 0: print("Thanks for using the program") break elif 1 <= linenumber <= len(lines) : print (lines[linenumber- 1]) else: print("Please enter valid line number") text_file.close()）。您无法阅读。将output_file更改为'w'。

Answer 2

您正在尝试读取文件，但是您使用参数'w'

以可写方式打开文件

与open（input（'输入要检查的第二个文件：'），'w'）为 output_file：

删除参数或将'w'替换为'r'

与open（input（'输入要检查的第二个文件：'））为 output_file：

OR

与open（input（'输入要检查的第二个文件：'），'w'）为 output_file：

如何比较两个文件，看看内容是否相同？

2 个答案: