Update README.md

plugins/input/templates/helloworld/README.md

@@ -14,6 +14,7 @@ When added to a map it provides a single point geometry representing
 the center of any query. This means that it should place a point in
 the middle of any map tile and display a "hello world!" label if used like:
 
+```xml
 <?xml version="1.0" encoding="utf-8"?>
 <Map srs="+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs" background-color="white">
     <Style name="style">
@@ -29,25 +30,11 @@ the middle of any map tile and display a "hello world!" label if used like:
         </Datasource>
     </Layer>
 </Map>
-
+```
 
 Or used in python like:
 
-from mapnik import *
-m = Map(600,400)
-m.background = Color('white')
-s = Style()
-r = Rule()
-r.symbols.append(PointSymbolizer())
-t = TextSymbolizer(Expression("[key]"),"DejaVu Sans Book",10,Color('black'))
-t.displacement = (15,15)
-r.symbols.append(t)
-s.rules.append(r)
-m.append_style('style',s)
-ds = Datasource(type="hello")
-l = Layer('test')
-l.styles.append('style')
-l.datasource = ds
-m.layers.append(l)
-m.zoom_all()
-render_to_file(m,'test.png')
+```
+import mapnik
+ds = mapnik.Datasource(type="hello")
+```