+
+def encode_filepath(path):
+ """Encodes a Unicode file path to a byte string.
+
+ On Python 2 this is a no-op; on Python 3 we encode the string as
+ suggested by [1] which allows an exact round-trip from the command line
+ to the filesystem.
+
+ [1] http://docs.python.org/3/c-api/unicode.html#file-system-encoding
+
+ """
+ if sys.hexversion < 0x03000000:
+ return path
+ return path.encode(sys.getfilesystemencoding(), 'surrogateescape')
+
+