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POHow to use virtualenv with Google App Engine SDK on Mac OS X 10.6
 

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  1. POHow to use virtualenv with Google App Engine SDK on Mac OS X 10.6
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    <p>I am pulling my hair out trying to figure this out because I had it working until last week and somehow it broke. </p> <p>When I setup a virtualenv for a Google App Engine app and start the app with <code>dev_appserver.py</code>, I get errors importing the standard library (like "ImportError: No module named base64").</p> <p>Here's what I'm doing:</p> <p>(Using the system Python)</p> <p><code>virtualenv --python=python2.5 --no-site-packages ~/.virtualenv/foobar</code></p> <p>Then I add the a <code>gae.pth</code> file to <code>~/.virtualenv/foobar/lib/python2.5/site-packages/</code> containing the Google App Engine libraries:</p> <pre><code>/usr/local/google_appengine /usr/local/google_appengine/lib/antlr3 /usr/local/google_appengine/lib/cacerts /usr/local/google_appengine/lib/django /usr/local/google_appengine/lib/fancy_urllib /usr/local/google_appengine/lib/ipaddr /usr/local/google_appengine/lib/webob_1_1_1 /usr/local/google_appengine/lib/yaml/lib </code></pre> <p>(That's based on <a href="https://stackoverflow.com/questions/2139693/unittest-import-error-with-virtualenv-google-app-engine-django/2450298#2450298">this answer</a>.)</p> <p>Then I source my "foobar" virtualenv and try to start my app with <code>dev_appserver.py</code>.</p> <p>The server starts but the first request errors out with the aforementioned "ImportError: No module named base64". If I visit the admin console I get "ImportError: No module named cgi".</p> <p>If I start up python, I can load these modules. </p> <pre><code>&gt;&gt;&gt; import base64 &gt;&gt;&gt; base64.__file__ '/System/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/base64.py' </code></pre> <p>It seems that the SDK's sandboxing is preventing these libraries from getting loaded. But like I said, I had this working until last week...something changed or I inadvertently broke my virtualenv and I can't figure out how I got it working in the first place.</p> <p>Software versions:</p> <p>Google App Engine SDK 1.3.7<br> Mac OS X Snow Leopard 10.6.4<br> virtualenv 1.5.1</p> <p><strong>Update:</strong> In response to Alan Franzoni's questions:</p> <p>I am using the system Python that came with Mac OS X. I installed virtualenv via easy_install. I upgraded to virtualenv 1.5.1 today to try to fix the problem.</p> <p>If I run <code>python /usr/local/bin/dev_appserver.py</code> with the virtualenv python, the problem persists. If I deactivate the virtualenv and run that command with the system python2.5, it works. (Also, I can use the GoogleAppEngineLauncher to start my app.)</p> <p>Here is a full stack trace (this one uses the Kay framework, but the problem is the same with webapp):</p> <pre><code>Traceback (most recent call last): File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/tools/dev_appserver.py", line 3206, in _HandleRequest self._Dispatch(dispatcher, self.rfile, outfile, env_dict) File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/tools/dev_appserver.py", line 3149, in _Dispatch base_env_dict=env_dict) File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/tools/dev_appserver.py", line 525, in Dispatch base_env_dict=base_env_dict) File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/tools/dev_appserver.py", line 2402, in Dispatch self._module_dict) File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/tools/dev_appserver.py", line 2312, in ExecuteCGI reset_modules = exec_script(handler_path, cgi_path, hook) File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/tools/dev_appserver.py", line 2208, in ExecuteOrImportScript exec module_code in script_module.__dict__ File "/Users/look/myapp/kay/main.py", line 17, in &lt;module&gt; kay.setup() File "/Users/look/myapp/kay/__init__.py", line 122, in setup from google.appengine.ext import db File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/tools/dev_appserver.py", line 1287, in Decorate return func(self, *args, **kwargs) File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/tools/dev_appserver.py", line 1937, in load_module return self.FindAndLoadModule(submodule, fullname, search_path) File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/tools/dev_appserver.py", line 1287, in Decorate return func(self, *args, **kwargs) File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/tools/dev_appserver.py", line 1839, in FindAndLoadModule description) File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/tools/dev_appserver.py", line 1287, in Decorate return func(self, *args, **kwargs) File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/tools/dev_appserver.py", line 1790, in LoadModuleRestricted description) File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/ext/db/__init__.py", line 81, in &lt;module&gt; import base64 ImportError: No module named base64 </code></pre>
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    1. COCould you please cut&paste the full output for such error? If you use "python /usr/local/bin/dev_appserver.py" does the error stay the same? Also, how did you install virtualenv, via setuptools? And are you using system python2.5, macports one, any combo of those?
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    2. COThanks for your response. I've updated the post to answer your questions.
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    3. COCan you type "which python" to ensure you are running the virtualenv Python?
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