cannot run helloworld in Google app engine launcher - google-app-engine

Question

Google App Engine Launcher suddenly not working when running any app, it works well yesterday.
Error produced:
wi2013-01-15 14:56:52 Running command: "['C:\\Python27\\pythonw.exe', 'C:\\Program Files (x86)\\Google\\google_appengine\\dev_appserver.py', '--admin_console_server=', '--port=8080', 'C:\\Users\\Lawrence\\Documents\\guestbook-2']"
Traceback (most recent call last):
File "C:\Program Files (x86)\Google\google_appengine\dev_appserver.py", line 171, in <module>
run_file(__file__, globals())
File "C:\Program Files (x86)\Google\google_appengine\dev_appserver.py", line 167, in run_file
execfile(script_path, globals_)
File "C:\Program Files (x86)\Google\google_appengine\google\appengine\tools\dev_appserver_main.py", line 166, in <module>
from google.appengine.tools import appcfg
File "C:\Program Files (x86)\Google\google_appengine\google\appengine\tools\appcfg.py", line 41, in <module>
import mimetypes
File "C:\Python27\Lib\mimetypes.py", line 29, in <module>
import urllib
File "C:\Python27\Lib\urllib.py", line 26, in <module>
import socket
File "C:\Python27\Lib\socket.py", line 47, in <module>
import _socket
ImportError: Module use of python25.dll conflict with this version of Python.
2013-01-15 14:56:52 (Process exited with code 1)
When you google this error, a lot of solution telling you to change the
System/ User Environment Variable to add C:\Python27;C:\Python27\Scripts; C:\Python27\Lib; C:\Python27\libs; etc, remove or add User Variable etc. All those trick not work for me.
I didn't install python25. Those programme refer to it and using import _socket are google app engine launcher itself or Google Drive, I have stopped my Google Drive already as people found this may cause problem. so I guess this GAE conflicted itself when some error happen inside it. The clue is I got another error in google app launcher log,C:\Program Files (x86)\Google\google_appengine\launcher\GoogleAppEngineLauncher.exe.log
I'm using win 7 64 bits, GAE 1.7.4, Python 2.7.3

Answer 1

You need to edit app.yaml
you should have:
runtime: python
replace with:
runtime: python27
threadsafe: true
Pay attention to threadsafe:
https://developers.google.com/appengine/docs/python/python25/migrate27#threadsafe
Other setting of app.yaml
https://developers.google.com/appengine/docs/python/config/appconfig#Required_Elements
If you start from Python 2.5 please read:
https:// developers.google.com/appengine/docs/python/python25/migrate27#appyaml