Simplify with built-in functions where possible. e.g.

change [x for x in y if x] to filter(None, y)
change [f(x) for x in y] to map(f, x)
change [x for x in y] to list(y)

These changes reduce source code size and complexity and produce some minor performance gains

svn: r14104

src/plugins/gramplet/FanChartGramplet.py

@@ -143,7 +143,7 @@ class FanChartWidget(gtk.Widget):
         self.data = {}
         for i in range(self.generations):
             # name, person, parents?, children?
-            self.data[i] = [(None, None, None, None) for j in range(2 ** i)]
+            self.data[i] = [(None,) * 4] * 2 ** i
             self.angle[i] = []
             angle = 0
             slice = 360.0 / (2 ** i)