无法导入那里的模块

Question

From command line I can't import appengine, this might be something with my python path:

$ python
Python 2.7.1+ (r271:86832, Apr 11 2011, 18:13:53) 
[GCC 4.5.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from google.appengine.ext import db
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "google/appengine/ext/db/__init__.py", line 98, in <module>
    from google.appengine.api import datastore
  File "google/appengine/api/datastore.py", line 62, in <module>
    from google.appengine.datastore import datastore_query
  File "google/appengine/datastore/datastore_query.py", line 64, in <module>
    from google.appengine.datastore import datastore_index
  File "google/appengine/datastore/datastore_index.py", line 60, in <module>
    from google.appengine.api import validation
  File "google/appengine/api/validation.py", line 51, in <module>
    import yaml
ImportError: No module named yaml
>>> 

I don't want duplicate installations, I want to point the Python interpretor to where the missing module is. How do I make the interpretor find the app engine modules from the command prompt? In the application these imports are working.

Answer 1

appending:

/usr/local/google_appengine/:/usr/local/google_appengine/lib/:/usr/local/google_appengine/lib/yaml/

to your PYTHONPATH environment variable should do the trick (your SDK location may vary).

Answer 2

For appengine 1.9.6 google has created a new directory "yaml-3.10" that contains the yaml module. I added "[appengine install directory]/google_appengine/lib/yaml-3.10" to PYTHONPATH in my .bashrc file and that solved this problem. BTW: I use Ubuntu 14.04 LTS.

Answer 3

yaml is not installed in your current setup. yaml package is included with google_appengine in the lib folder. the setup.py script in the folder will add the yaml package to your current python

cd google_appengine/lib/yaml
sudo python setup.py install