这是我的代码，非常简单：

#borders of the bbox
longmax = 15.418483 #longitude top right
longmin = 4.953142 #longitude top left
latmax = 54.869808 #latitude top 
latmin = 47.236219 #latitude bottom

#longitude
longstep = longmax - longmin 
longstepx = longstep / 1000 #longitudal steps the model shall perfom


#latitude
latstep = latmax - longmin
latstepx = latstep / 1000 #latitudal steps the model shall perform

我尝试在Python IDLE（python 3.3）中运行它，并且发生此错误消息

SyntaxError: multiple statements found while compiling a single statement

删除“＃”就可以了。

怎么了？！