Remove flavour.has_drv.

Author: barneygale

Lib/pathlib.py

@@ -55,8 +55,6 @@ class _WindowsFlavour(_Flavour):
     # Reference for Windows paths can be found at
     # http://msdn.microsoft.com/en-us/library/aa365247%28v=vs.85%29.aspx
 
-    has_drv = True
-
     def casefold(self, s):
         return s.lower()
 
@@ -65,8 +63,6 @@ def casefold_parts(self, parts):
 
 
 class _PosixFlavour(_Flavour):
-    has_drv = False
-
     def casefold(self, s):
         return s
 
@@ -737,9 +733,7 @@ def parents(self):
     def is_absolute(self):
         """True if the path is absolute (has both a root and, if applicable,
         a drive)."""
-        if not self._root:
-            return False
-        return not self._flavour.has_drv or bool(self._drv)
+        raise NotImplementedError
 
     def is_reserved(self):
         """Return True if the path contains one of the special names reserved
@@ -805,6 +799,9 @@ def _splitroot(cls, part):
         else:
             return '', '', part
 
+    def is_absolute(self):
+        return bool(self._root)
+
     def is_reserved(self):
         return False
 
@@ -894,6 +891,9 @@ def _split_extended_path(cls, s, ext_prefix=_ext_namespace_prefix):
                 s = '\\' + s[3:]
         return prefix, s
 
+    def is_absolute(self):
+        return bool(self._root) and bool(self._drv)
+
     def is_reserved(self):
         # NOTE: the rules for reserved names seem somewhat complicated
         # (e.g. r"..\NUL" is reserved but not r"foo\NUL").