PyGTK 除錯

1. import 的 gtk modules 找不到，錯誤訊息如下：

   [dywang@dywhd2 zzz]$ python mypy1.py 
   7
   'import site' failed; use -v for traceback
   Traceback (most recent call last):
     File "mypy1.py", line 5, in <module>
       import gtk
   ImportError: No module named gtk
   

2. 查詢安裝套件 pygtk2 已安裝。

   [root@dywhd2 ~]# rpm -qa | grep pygtk
   pygtk2-libglade-2.16.0-3.el6.x86_64
   pygtksourceview-2.8.0-1.el6.x86_64
   pygtk2-2.16.0-3.el6.x86_64
   

3. 查詢 pygtk module 在目錄 /usr/lib64/python2.6/site-packages/ 下。

   [root@dywhd2 ~]# find /usr/lib64/python2.6 -name pygtk*
   /usr/lib64/python2.6/site-packages/pygtk.pyc
   /usr/lib64/python2.6/site-packages/pygtk.py
   /usr/lib64/python2.6/site-packages/pygtk.pth
   /usr/lib64/python2.6/site-packages/pygtk.pyo
   

4. 執行 python 後進入互動式模式， import pygtk 模組不成功，顯示 sys.path 發覺/usr/lib64/python2.6/site-packages/ 目錄並不在其中。

   [dywang@dywhd2 zzz]$ python
   7
   'import site' failed; use -v for traceback
   Python 2.6.5 (r265:79063, Nov 12 2010, 00:52:45) 
   [GCC 4.4.4 20100525 (Red Hat 4.4.4-5)] on linux2
   Type "help", "copyright", "credits" or "license" for more information.
   >>> import pygtk; pygtk.require('2.0')
   Traceback (most recent call last):
     File "<stdin>", line 1, in <module>
   ImportError: No module named pygtk
   >>> import sys
   >>> print sys.path
   ['', '', '/usr/local/google_appengine', 
   '/usr/local/google_appengine/lib/django_1.4', 
   '/usr/lib64/python26.zip', 
   '/usr/lib64/python2.6/', 
   '/usr/lib64/python2.6/plat-linux2', 
   '/usr/lib64/python2.6/lib-tk', 
   '/usr/lib64/python2.6/lib-old', 
   '/usr/lib64/python2.6/lib-dynload']
   

5. 解決方式：編輯 /etc/bashrc，將 PYTHONPATH 變數增加 /usr/lib64/python2.6/site-packages/ 目錄，讓任何用戶登入後就生效。

   [root@dywhd2 ~]# vim /etc/bashrc 
   [root@dywhd2 ~]# tail -n1 /etc/bashrc 
   export PYTHONPATH="/usr/lib64/python2.6/site-packages:${PYTHONPATH}"
   

6. 重新取得 bash shell 後，查詢 PYTHONPATH 變數已包含 /usr/lib64/python2.6/site-packages/ 目錄。

   [dywang@dywhd2 ~]$ echo $PYTHONPATH
   /usr/lib64/python2.6/site-packages::/usr/local/google_appengine:/usr/local/google_appengine/lib/django_1.4
   

7. 再執行 python 進入互動式模式，import pygtk 或 import gtk 都成功取得 module，不再出現錯誤訊息。

   [dywang@dywhd2 ~]$ python
   Python 2.6.5 (r265:79063, Nov 12 2010, 00:52:45) 
   [GCC 4.4.4 20100525 (Red Hat 4.4.4-5)] on linux2
   Type "help", "copyright", "credits" or "license" for more information.
   >>> import pygtk
   >>> import gtk
   >>>