I learned today that in python on windows, doing `os.chdir('f:\\')` is very different than doing `os.chdir('f:')`. The command with the trailing backslash actually changes the current directory. Without the backslash, the command is like typing `f:` in the command prompt, and changes the current directory to the last current directory on the `f` drive.

Here's an example:

```
import time
import os
if __name__ == '__main__':
    os.chdir('f:\\directory')
    print 'cwd is {}'.format(os.getcwd())
    os.chdir('d:\\directory')
    print 'cwd is {}'.format(os.getcwd())
    os.chdir('f:')
    print 'cwd is {}'.format(os.getcwd())
    os.chdir('f:\\')
    print 'cwd is {}'.format(os.getcwd())

```

prints

```
cwd is f:\directory
cwd is d:\directory
cwd is f:\directory
cwd is f:\

```

I can understand why this difference is useful, but couldn't find anything documenting this behavior. I'd gotten used to leaving trailing slashes off my directories as I usually use here strings...

Is this behavior documented anywhere? Can I rely on it not changing?