Exif.GPSInfo tags not accepting GPSCoordinate type

[Jim Easterbrook]

Here's a simple test script:

import pyexiv2

coord = pyexiv2.utils.GPSCoordinate(51, 35, 25.678, 'N')
md = pyexiv2.ImageMetadata('')
md['Exif.GPSInfo.GPSLatitude'] = coord

When I run this I get an exception:

Traceback (most recent call last):
  File "code/photini/test_gps.py", line 7, in <module>
    md['Exif.GPSInfo.GPSLatitude'] = coord
  File "/usr/lib/python2.7/dist-packages/pyexiv2/metadata.py", line 271, in __setitem__
    return getattr(self, '_set_%s_tag' % family)(key, tag_or_value)
  File "/usr/lib/python2.7/dist-packages/pyexiv2/metadata.py", line 219, in _set_exif_tag
    tag = ExifTag(key, tag_or_value)
  File "/usr/lib/python2.7/dist-packages/pyexiv2/exif.py", line 107, in __init__
    self._set_value(value)
  File "/usr/lib/python2.7/dist-packages/pyexiv2/exif.py", line 197, in _set_value
    self.raw_value = self._convert_to_string(value)
  File "/usr/lib/python2.7/dist-packages/pyexiv2/exif.py", line 431, in _convert_to_string
    raise ExifValueError(value, self.type)
pyexiv2.exif.ExifValueError: Invalid value for EXIF type [Rational]: [51,35,25N]

[Olivier Tilloy (osomon)]

I can reliably reproduce with pyexiv2 0.3.2 (0.3.2-5ubuntu1 on Ubuntu 12.10).