Django Exif数据：“IFDRational”对象不可订阅

Question

我在代码中遇到了一个问题：'IFDRational‘对象不可订阅

这是痕迹：

lat = get_decimal_from_dms(geotags['GPSLatitude'], geotags['GPSLatitudeRef'])
degrees = dms[0][0] / dms[0][1] 

is问题是:可变值dms (45.0，46.0，34.29)

{'GPSAltitude': 22.90324416619237,
 'GPSAltitudeRef': b'\x00',
 'GPSDateStamp': '2020:10:17',
 'GPSDestBearing': 18.1919587128,
 'GPSDestBearingRef': 'M',
 'GPSHPositioningError': 65.0,
 'GPSImgDirection': 108.199192887128,
 'GPSImgDirectionRef': 'M',
 'GPSLatitude': (12.0, 26.0, 14.09),
 'GPSLatitudeRef': 'N',
 'GPSLongitude': (1.0, 47.0, 39.38),
 'GPSLongitudeRef': 'E',
 'GPSSpeed': 0.0,
 'GPSSpeedRef': 'K',
 'GPSTimeStamp': (12.0, 58.0, 42.0)}

比如我从一张照片中得到的。我认为代码将GPSLatitudeRef同化为dms / dms。问题是，GPSLatitudeRef是一个字母，没有一个数字。

def get_geotagging(exifgps):
    
        geotagging = {}
        for (idx, tag) in TAGS.items():
            if tag == 'GPSInfo':
                if idx not in exifgps:
                    raise ValueError("No EXIF geotagging found")
    
                for (key, val) in GPSTAGS.items():
                    if key in exifgps[idx]:
                        geotagging[val] = exifgps[idx][key]
    
        return geotagging
        
    def get_decimal_from_dms(dms, ref):

        degrees = dms[0][0] / dms[0][1]
        minutes = dms[1][0] / dms[1][1] / 60.0
        seconds = dms[2][0] / dms[2][1] / 3600.0
    
        if ref in ['S', 'W']:
            degrees = -degrees
            minutes = -minutes
            seconds = -seconds
    
        return round(degrees + minutes + seconds, 5)
        
    def get_lat_coordinates(geotags):
            lat = get_decimal_from_dms(geotags['GPSLatitude'], geotags['GPSLatitudeRef'])
            return lat
            
    def get_lon_coordinates(geotags):
            lon = get_decimal_from_dms(geotags['GPSLongitude'], geotags['GPSLongitudeRef'])
            return lon

try:
            exifgps = img.getexif()
            geotags = get_geotagging(exifgps)
            self.gpsinfo = geotags
        except Exception as e:
                pass
        
        #try:
        exifgps = img.getexif()
        geotags = get_geotagging(exifgps)
        self.latitude = get_lat_coordinates(geotags)
        #except Exception as e:
                #pass
        
        #try:
        exifgps = img.getexif()
        geotags = get_geotagging(exifgps)
        self.longitude = get_lon_coordinates(geotags)
        #except Exception as e:
                #pass

Answer 1

我无法理解为什么degrees = dms[0][0] / dms[0][1]是必要的，因为您可以使用degrees = dms[0]从元组中提取度。

取代

def get_decimal_from_dms(dms, ref):

    degrees = dms[0][0] / dms[0][1]
    minutes = dms[1][0] / dms[1][1] / 60.0
    seconds = dms[2][0] / dms[2][1] / 3600.0

与

def get_decimal_from_dms(dms, ref):

    degrees = dms[0]
    minutes = dms[1] / 60.0
    seconds = dms[2] / 3600.0