Equivalent of shell 'cd' command to change the working directory?
You can change the working directory with:
There are two best practices to follow when using this method:
- Catch the exception (WindowsError, OSError) on invalid path. If the exception is thrown, do not perform any recursive operations, especially destructive ones. They will operate on the old path and not the new one.
- Return to your old directory when you're done. This can be done in an exception-safe manner by wrapping your chdir call in a context manager, like Brian M. Hunt did in his answer.
Changing the current working directory in a subprocess does not change the current working directory in the parent process. This is true of the Python interpreter as well. You cannot use
os.chdir() to change the CWD of the calling process.
Here's an example of a context manager to change the working directory. It is simpler than an ActiveState version referred to elsewhere, but this gets the job done.
import osclass cd: """Context manager for changing the current working directory""" def __init__(self, newPath): self.newPath = os.path.expanduser(newPath) def __enter__(self): self.savedPath = os.getcwd() os.chdir(self.newPath) def __exit__(self, etype, value, traceback): os.chdir(self.savedPath)
import subprocess # just to call an arbitrary command e.g. 'ls'# enter the directory like this:with cd("~/Library"): # we are in ~/Library subprocess.call("ls")# outside the context manager we are back wherever we started.