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[merge] robert's knit-performance work

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bzrlib/doc/api/transport.txt
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The Transport API in bzrlib provides URL based access to network resources.
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   >>> import os
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   >>> import sys
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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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   >>> if sys.platform == 'win32':
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   ...     root = transport.get_transport_from_url('file:///C:/')
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   ... else:
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   ...     root = transport.get_transport_from_url('file:///')
 
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   >>> root = transport.get_transport("file:///")
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   >>>
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Each Transport instance represents a single logical directory.
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   >>> dir = transport.get_transport_from_path(".")
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   >>> local_path_from_url(dir.base) == getcwd() + '/'
 
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   >>> dir = transport.get_transport(".")
 
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   >>> dir.base == os.getcwdu() + '/'
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   True
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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('/') + '/')
 
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   >>> parent.base == os.path.dirname(os.getcwdu()) + '/'
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   True