This is not a bug. Calling GObject.Type() is the general GObject
constructor which you can only call with initializing properties, as
keyword arguments. What you want is to explicitly call a constructor of
the Metadata class. In that case there is only one,
gexiv2_metadata_new(), which translates as
GExiv2.Metadata.new('foo.png'), but in many cases there are several (e.
g. Gtk.Button.new_with_label('label').

This might be confusing as a lot of the standard Gtk widgets *can* be
called like that, as they have overrides. However, these have been
deprecated at last, as they are confusing, error prone, and ambiguous
(https://wiki.gnome.org/action/show/Projects/PyGObject/InitializerDeprecations).

** Changed in: gexiv2 (Ubuntu)
       Status: New => Invalid

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

Title:
  GExiv2 python wrapper broken

Status in “gexiv2” package in Ubuntu:
  Invalid

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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