Import error about gi.repository

[daedae11 <daedae11 126 com>]

HI,
I clone meld from https://git.gnome.org/browse/meld.
Then execute:
python setup.py build
python setup.py install
meld

There is an error after the execution of meld. The details is :
Traceback (most recent call last):
  File "/usr/bin/meld", line 67, in <module>
    import meld.settings
  File "/usr/local/lib/python2.7/site-packages/meld/settings.py", line 19, in <module>
    from gi.repository import Gio
ImportError: No module named gi.repository
Help, please,