After I have updated Google App Engine to 126.96.36.1999, the command "dev_appserver.py" did not run even with the absolute path.
$ pwdIf you find yourself in the same situation, there are 2 kinds of solutions:
$ /usr/local/google_appengine/dev_appserver.py ../helloworld/
-bash: cd: /Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine: No such file or directory
- Unzip an archive file named /Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine.zip
- Run GoogleAppEngineLauncher.app (for the first time after upgrade) and "Make Command Symlinks." The zip archive seems to be unzipped.