Error with pyexiv2. How to apply metadata to jpg image?

Question

I am writing a python3-based script designed to automate the process of applying geo-tags to .jpg images based on extracted EXIF metadata.

PIL is used to open images and read the EXIF metadata and pyexiv2 is used to apply geo-tags to the .jpg images.

The code for the applying geotags is shown here:

# Convert decimal coordinates to degrees, minutes, seconds
def to_degree(value, loc):
    if value < 0:
        loc_value = loc[0]
    elif value > 0:
        loc_value = loc[1]
    else:
        loc_value = ""
    abs_value = abs(value)
    deg =  int(abs_value)
    t1 = (abs_value-deg)*60
    min = int(t1)
    sec = round((t1 - min)* 60, 5)
    return (deg, min, sec, loc_value)

# Apply geotags to photos based on converted latitude and longitude
def apply_geotags(photo, lat, lng):
    # Convert coordinates into degrees, munutes and seconds
    lat_deg = to_degree(lat, ["S", "N"])
    lng_deg = to_degree(lng, ["W", "E"])                
    print(lat_deg)
    print(lng_deg)

    # Error here:
    # AttributeError: module 'pyexiv2' has no attribute 'Rational'
    exiv_lat = (pyexiv2.Rational(lat_deg[0]*60+lat_deg[1],60),pyexiv2.Rational(lat_deg[2]*100,6000), pyexiv2.Rational(0, 1))
    exiv_lng = (pyexiv2.Rational(lng_deg[0]*60+lng_deg[1],60),pyexiv2.Rational(lng_deg[2]*100,6000), pyexiv2.Rational(0, 1))
    print(exiv_lat)
    print(exiv_lng) 

    # Error here:
    # AttributeError: module 'pyexiv2' has no attribute 'ImageMetadata'
    metadata = pyexiv2.ImageMetadata(photo)
    metadata.read()

    metadata["Exif.GPSInfo.GPSLatitude"] = exiv_lat
    metadata["Exif.GPSInfo.GPSLatitudeRef"] = lat_deg[3]
    metadata["Exif.GPSInfo.GPSLongitude"] = exiv_lng
    metadata["Exif.GPSInfo.GPSLongitudeRef"] = lng_deg[3]
    metadata["Exif.Image.GPSTag"] = 654
    metadata["Exif.GPSInfo.GPSMapDatum"] = "WGS-84"
    metadata["Exif.GPSInfo.GPSVersionID"] = '2 0 0 0'

    metadata.write()

I am encountering several errors all related to pyexiv2 including

AttributeError: module 'pyexiv2' has no attribute 'Rational'

and

AttributeError: module 'pyexiv2' has no attribute 'ImageMetadata'

Any other recommendations for libraries that can apply/update metadata for .jpg images would also be appreciated.

Answer 1

I think you misread the documentation of pyexiv2 or you mistype the package name when installing with pip. The example on the github page does not mention ImageMetadata or Rational classes. It only modify a dictionary.

Edit: @psf highlights to me a package with a different name but using the same import py3exiv2. In this package, I cannot find any Rational class to import but there is a class fractions.Fraction for exif metadata.