_path: change components from a list into a tuple

1 files changed, 8 insertions, 7 deletions

diff --git a/lbup/_path.py b/lbup/_path.py
index 27f7072..994611f 100644
--- a/lbup/_path.py
+++ b/lbup/_path.py
@@ -10,11 +10,12 @@ class AbsPath:
                 path = path.encode('utf-8')
             if len(path) < 1 or not path.startswith(b'/'):
                 raise ValueError('Path does not look like valid absolute path', path)
-            components = list(filter(lambda x: len(x) > 0 and x != b'.', path[1:].split(b'/')))
-            if b'..' in components:
-                raise ValueError('Parent references are not allowed', path)
+            components = filter(lambda x: len(x) > 0 and x != b'.', path[1:].split(b'/'))
 
-        self._components = components
+        self._components = tuple(components)
+
+        if b'..' in self.components:
+            raise ValueError('Parent references are not allowed: %s' % self)
 
     def __bytes__(self):
         return self.path
@@ -41,10 +42,10 @@ class AbsPath:
     @property
     def components(self):
         """
-        Return a list of path components.
+        A tuple of path components.
 
-        Note that root does not count as a component, so a path of b'/' returns
-        an empty list.
+        Note that root does not count as a component, so for a path of b'/' this
+        is an empty tuple.
         """
         return self._components