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-rw-r--r--pym/portage/util/digraph.py10
1 files changed, 9 insertions, 1 deletions
diff --git a/pym/portage/util/digraph.py b/pym/portage/util/digraph.py
index df024fb4b..1bbe10f61 100644
--- a/pym/portage/util/digraph.py
+++ b/pym/portage/util/digraph.py
@@ -1,9 +1,11 @@
-# Copyright 2010 Gentoo Foundation
+# Copyright 2010-2011 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
__all__ = ['digraph']
from collections import deque
+import sys
+
from portage import _unicode_decode
from portage.util import writemsg
@@ -221,6 +223,9 @@ class digraph(object):
root_nodes.append(node)
return root_nodes
+ def __bool__(self):
+ return bool(self.nodes)
+
def is_empty(self):
"""Checks if the digraph is empty"""
return len(self.nodes) == 0
@@ -332,3 +337,6 @@ class digraph(object):
__contains__ = contains
empty = is_empty
copy = clone
+
+ if sys.hexversion < 0x3000000:
+ __nonzero__ = __bool__