def lon2zone(lon):
 zone = int(round(((lon / 6.0) + 30.5)))
 return (((zone - 1) % 60) + 1)

def lon2zone ( lon ) : zone = int ( round ( ( ( lon / 6.0 ) + 30.5 ) ) ) return ( ( ( zone - 1 ) % 60 ) + 1 )
convert longitude to numeric utm zone .