使用 python 在命令提示符中更改当前工作目录

Question

I am trying to write a python script that will change my cwd to the desired directory. I was not able to do this task directly from python so I wrote a simple batch script to do that.

Changedir.bat

@echo off
chdir /D F:\cygwin\home\

If I execute the above script directly in my cmd it works fine but if I try to execute it with a python script nothing happens. My cwd remains same.

PythonScript.py

import shlex,subprocess

change_dir = r'cmd.exe /c C:\\Users\\test.bat'
command_change = shlex.split(change_dir)
subprocess.call(command_change)

Answer 1

Of course this can't work, because subprocess.call is spawning whole new process for your script. This executes the script in a completely separate environment.

Answer 2

If you want to change directory in the command prompt you have to use either cd or a .bat script.

You can't get another process (ie Python) to do it because changes to the current directory, made in another process are not reflected back to the parent process. The reason the .bat script works is that it is processed by the command shell that invokes it rather than by a child process.

Answer 3

You could try this. It works in Linux to change the CWD of the current shell. It is horrible.

def quote_against_shell_expansion(s):
    import pipes
    return pipes.quote(s)

def put_text_back_into_terminal_input_buffer(text):
    # use of this means that it only works in an interactive session
    # (and if the user types while it runs they could insert
    #  characters between the characters in 'text')
    import fcntl, termios
    for c in text:
        fcntl.ioctl(1, termios.TIOCSTI, c)

def change_shell_working_directory(dest):
    put_text_back_into_terminal_input_buffer("cd "+quote_against_shell_expansion(dest)+"\n")