def circle1():
    path = Path(path_top)

    ye = path_refer[:4]
    mo = path_refer[4:6]
    da = path_refer[6:8]

    if ye.startswith("*") and ye != "***":
        ye = "*"
        mo = path_refer[1:3]
        da = path_refer[3:5]
    elif mo.startswith("*") and mo != "**":
        mo = "*"
        da = path_refer[5:7]
    elif path_refer == "***":
        ye = "*"
        mo = "*"
        da = "*"

    arr = numpy.zeros((rows, columns), dtype=np_band_type)

    for s in path.glob('{}/{}/{}'.format(ye, mo, da)):
        if os.path.isdir(s):
            listdir = os.listdir(s)
            os.chdir(os.path.join(path_top, s))

            for a_img in listdir:
                if a_img.startswith(refer[:5]) and int(a_img[5:9]) >= year_beg and int(a_img[5:9]) <= year_end:
                    for b_img in listdir:
                        if b_img.startswith(refer[:5]) and int(b_img[9:11]) >= month_beg and int(b_img[9:11]) <= month_end:
                            for c_img in listdir:
                                if c_img.startswith(refer[:5]) and int(c_img[11:13]) >= day_beg and int(c_img[11:13]) <= day_end:
                                    for d_img in listdir:
                                        if d_img.startswith(refer[:5]) and int(d_img[-8:-6]) >= hour_beg and int(d_img[-8:-6]) <= hour_end:
                                            ds = gdal.Open(str(d_img), gdal.GA_ReadOnly)

                                            band = ds.GetRasterBand(b_num_wor)
                                            b_arr = band.ReadAsArray(0, 0, columns, rows).astype(np_band_type)
                                            for r in range(rows):
                                                for c in range(columns):
                                                    if param_type == "lt":
                                                        if param_x < b_arr[r,c]:
                                                            arr[r,c] += 1
                                                    elif param_type == "let":
                                                        if param_x > b_arr[r,c]:
                                                            arr[r,c] += 1
                                                    elif param_type == "dr":
                                                        if param_x < b_arr[r,c] < param_y:
                                                            arr[r,c] += 1

    return arr

measure_source = gdal.Open(MyReferenceFile)
v_band = measure_source.GetRasterBand(b_num_wor)
gdal_band_type = v_band.DataType
np_band_type = gdal_array.GDALTypeCodeToNumericTypeCode(gdal_band_type)

line 175, in circle1
    band = ds.GetRasterBand(b_num_wor)
AttributeError: 'NoneType' object has no attribute 'GetRasterBand'