A few debugging tips:
You can verify introspection overrides are brought in by looking at the private 
"_overrides_module" attribute of a library:

(this is on Fedora so Ubuntu will give a different location)
python3 -c "from gi.repository import Gtk; print(Gtk._overrides_module)"
<module 'gi.overrides.Gtk' from 
'/usr/lib64/python3.3/site-packages/gi/overrides/Gtk.py'>

If you do the same thing with GExiv2, you should get a similar result in terms 
of output. It may also be a good idea to look at the result of Gtk.py to ensure 
the directory GExiv2.py found with "locate" is in the same place:
python3 -c "from gi.repository import GExiv2; print(GExiv2._overrides_module)"
<module 'gi.overrides.GExiv2' from 
'/usr/lib64/python3.3/site-packages/gi/overrides/GExiv2.py'>

Also note Python2 and 3 will require separate installs of the overrides
to their respective site-packages/dist-packages directory.

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https://bugs.launchpad.net/bugs/1277894

Title:
  GExiv2 python wrapper broken

Status in “gexiv2” package in Ubuntu:
  Confirmed

Bug description:
  Ubuntu Trusty Tahr (development branch)
  Release:      14.04
  gir1.2-gexiv2-0.4:  Installed: 0.7.0-1

  I can import the Python wrapper, but when initializing a Metadata object, I 
get an error:
  "TypeError: GObject.__init__() takes exactly 0 arguments (1 given)"

  It doesn't work in both python 2.7 and 3.3.

  $ python
  >>> from gi.repository import GExiv2
  >>> GExiv2.Metadata('foo.png')
  Traceback (most recent call last):
    File "<stdin>", line 1, in <module>
  TypeError: GObject.__init__() takes exactly 0 arguments (1 given)
  >>> 

  $ python3
  >>> from gi.repository import GExiv2
  >>> GExiv2.Metadata('foo.png')
  Traceback (most recent call last):
    File "<stdin>", line 1, in <module>
  TypeError: GObject.__init__() takes exactly 0 arguments (1 given)
  >>> 

  p.s. according to: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=697204#32
  the Python overrides are not installed?
  however, they seem to be:

  $ locate GExiv2.py
  /usr/lib/python2.7/dist-packages/gi/overrides/GExiv2.py
  /usr/lib/python3/dist-packages/gi/overrides/GExiv2.py

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