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The Transport API in bzrlib provides URL based access to network resources.
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>>> from bzrlib.osutils import getcwd, dirname
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>>> from bzrlib.urlutils import local_path_from_url
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>>> import bzrlib.transport as transport
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>>> root = transport.get_transport("file:///")
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Each Transport instance represents a single logical directory.
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>>> dir = transport.get_transport(".")
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>>> local_path_from_url(dir.base) == getcwd() + '/'
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You can change directories via the clone method:
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>>> parent = dir.clone('..')
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>>> local_path_from_url(parent.base) == (dirname(getcwd()).rstrip('/') + '/')