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Thu Jan 26 21:07:57 CET 2006 · https://mail.python.org/pipermail/python-dev/2006-January/060129.html

One other benefit that I neglected to put into the previous post - I was 
able to maintain separate cwd's for each tree.

An example of use:

Each tree has its own context, independent of the context of python:

 >>> local, local2 = fs.LocalTree(), fs.LocalTree()
 >>> local.pwd
'/home/targoz'
 >>> local2.pwd
'/home/targoz'
 >>> os.getcwd()
'/home/targoz'
 >>> local.chdir('..')
 >>> local2.chdir('www')
 >>> local.pwd
'/home'
 >>> local2.pwd
'/home/targoz/www'
 >>> os.getcwd()
'/home/targoz'

Remote trees have the same interface:

 >>> remote_login_data = {'username': 'targoz', 'password': 'my_pass', 
host': 'hostname.com'}
 >>> remote = fs.SSHTree(access=remote_login_data)
 >>> remote.pwd()
'/home/nportal'

Trees can interact, regardless of whether they are local or remote:

 >>> local2.listdir('files')
['myfile', 'otherfile.txt']
 >>> remote.listdir()
[]
 >>> localfile = local2.open(('targoz/myfile') # Opens a file-like object
 >>> remote.savefile(localfile, 'remote_name')
 >>> remote.listdir()
['myfile']

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[Python-Dev] The path module PEP