Question

我目前正在学习Zed Shaw的LPTHW，但发现了问题。

我正在尝试自己编写整个代码（当然没有行号）

    from sys import argv
    from os.path import exists

    script, from_file, to_file = argv

    print "Copying from %s to %s" % (from_file, to_file)

    # we could do these two on one line too, how?
    in_file = open(from_file)
    indata = in_file.read()

    print "The input file is %d bytes long" % len(indata)

    print "Does the output file exist? %r" % exists(to_file)
    print "Ready, hit RETURN to continue, CTRL- C to abort."
    raw_input()
    out_file = open(to_file, 'w')
    out_file.write(indata)

    print "Alright, all done."

    out_file.close()
    in_file.close()

，但是代码不起作用。我一直在寻找错误，但似乎找不到任何错误，因此出于无奈，我删除了编写的代码并重写了新代码，但是这次我完全从电子书中复制了代码以确保我没有犯任何错误。事实证明还不错。 cmd改为显示

    D:\Coding>python ex17.py test.txt new_file.txt
    Copying from test.txt to new_file.txt
    Traceback (most recent call last):
      File "ex17.py", line 9, in <module>
        in_file = open(from_file)
    IOError: [Errno 2] No such file or directory: 'test.txt'

我真的不知道问题出在哪里，因为直接从电子书中复制代码也无济于事。另外，当我尝试插入cat命令时收到了此消息。

    D:\Coding>cat test.txt
    'cat' is not recognized as an internal or external command,
    operable program or batch file.

这是为什么？预先感谢。

Answer 1

D:\Coding>python ex17.py test.txt new_file.txt
Copying from test.txt to new_file.txt
Traceback (most recent call last):
  File "ex17.py", line 9, in <module>
    in_file = open(from_file)
IOError: [Errno 2] No such file or directory: 'test.txt'

最后一个回溯告诉您文件text.txt不存在。当您的程序尝试读取它时，它就会崩溃。

D:\Coding>cat test.txt
'cat' is not recognized as an internal or external command,
operable program or batch file.

如评论Vikas Gautam所述，Windows无法理解cat，因为它是Linux命令。

前进，这是您可以做的三件事：

了解等效的Windows命令并在执行示例时替换它们。
在Windows https://www.howtogeek.com/249966/how-to-install-and-use-the-linux-bash-shell-on-windows-10/上使用bash
移至linux。
按照编写的教程牢记窗口。

如何解决“无此文件或目录”？ [LPTHW第17章示例]

1 个答案: