I'm working on windows vista, but I'm running python from DOS command. I have this simple python program. (It's actually one py file named test.py)
import os
os.system('cd ..')
When I execute "python test.py" from a Dos command, it doesn't work. For example, if the prompt Dos Command before execution was this:
C:\Directory>
After execution, must be this:
C:\>
Help Plz.
First, you generally don't want to use os.system - take a look at the subprocess module instead. But, that won't solve your immediate problem (just some you might have down the track) - the actual reason cd won't work is because it changes the working directory of the subprocess, and doesn't affect the process Python is running in - to do that, use os.chdir.
os.chdir(newworkingdir) followed by subprocess.call(['cmd']) will do what you want. Changing Python's working directory will have a flow-on effect onto every subprocess you spawn after that point.cmd takes an argument for changing its prompt or looks at an environment variable (as the equivalents on *nix tend to), but a brief search finds nothing suggesting that that is the case. Sending a command into an open cmd would work, but be nontrivial - even if cmd listens for commands on STDIN, Python doesn't currently have async IO in the stdlib. Invoking prompt as a subprocess won't work for the same reason that invoking cd as a subprocess won't work. So, if it is doable, it probably isn't easy.I don't really use Windows, but you can try cmd /k yourcommandhere. This executes the command and then returns to the CMD prompt.
So for example, maybe you can do what you want like this:
subprocess.call(['cmd', '/k', 'cd .. && prompt changed'])
As I said, I am not familiar with Windows, so the syntax could be wrong, but you should get the idea.
In case you don't know, this is a different CMD instance than the one you were in before you started your python script. So when you exit, your python script should continue execution, and after it's done, you'll be back to your original CMD.
os.chdir('..')