在循环中将栅格波段分配给变量名称-“无法分配”错误

Question

I want to write two nested loops that iterate over the RGB bands of a series of eight JPG images. Later on these images shall be combined into one array channel by channel, so each array of the channels first has to have a proper name:

for ColorBand in [1, 2, 3]:
        for eighth in range(0,8):
            rastername="20140525-16-20-00_full_"+str(eighth)+"_0.jpg"
            raster =gdal.Open(rastername)
            band = raster.GetRasterBand(ColorBand)
            "eighth_"+str(eighth)+"_"+ColorBand = band.ReadAsArray()

Unfortunately, this returns a "can't assign to function call" error. I couldn't really find a proper answer how to solve this in other questions. Can anyone help?

Answer 1

The error is in the line:

"eighth_"+str(eighth)+"_"+ColorBand = band.ReadAsArray()

It appears that you are trying to create a variable name and assign to it the result of band.ReadAsArray() .

You could create a dictionary, say color_dict and make "eighth_"+str(eighth)+"_"+ColorBand as the key and use it to assign the value of band.ReadAsArray() . ie,

color_dict = {}
color_dict["eighth_"+str(eighth)+"_"+ColorBand] = band.ReadAsArray()

Later in your code you can access this data as color_dict["eighth_"+str(eighth)+"_"+ColorBand]