# when +proj=merc 
bbox = mapnik.Envelope(0.0, 0.0, 6000000.0, 5000000.0) 
# mercator is tortile shape 

# when +proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs 
bbox = mapnik.Envelope(mapnik.Coord(0.0, 0.0), mapnik.Coord(90.0, 40.0)) 
# mercator is blank 

how can i get the right mercator photo? 
%-|
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