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/docgen/TextBufDoc.py

@@ -149,7 +149,7 @@ class TextBufDoc(BaseDoc, TextDoc):
 
             tab_array = pango.TabArray(len(new_tabs)+1,True)
             index = 0
-            for tab in [ pixels(x) for x in new_tabs ]:
+            for tab in map(pixels, new_tabs):
                 tab_array.set_tab(index, pango.TAB_LEFT, tab)
                 index += 1
             tag.set_property("tabs", tab_array)