Why isn't PyCharm's autocomplete working for libraries I install?

Question

PyCharm's autocomplete isn't working for installed libraries. I have the following code:

from boto.emr.connection import EmrConnection
conn = EmrConnection(aws_keys.access_key_id, aws_keys.secret_key)

I want the editor to tell me what methods I have available to me when I press Ctrl+Space.

The boto library is installed in my environment, but it doesn't seem to be detected by PyCharm. How can I set this up correctly?

Solution

You've installed the 3rd-party library into a virtualenv, but PyCharm doesn't know about that by default. If nothing is specified, it will choose the system Python install as the interpreter. You need to go into the project settings and configure the interpreter to point at the virtualenv. PyCharm will then index the interpreter and allow you to autocomplete.

The virtualenv may be auto-detected in the dropdown menu on the left. If it is not, click the gear to the right, click "Add local", and select /path/to/virtualenv/bin/python (or \Path\to\virtualenv\Scripts\python.exe on Windows).