I'm trying to import pycassa library in a Python project in Aptana 3, but in the line "import pycassa" it show me the next error: "Unresolved import: pycassa". I installed pycassa with easy install and if I run "import pycassa" in a python shell it run with no errors. If I run the Aptana project run with no errors too, but the error mark continues. Why?
Sorry for my english.
The only working solution for me: open menu “Window” → “Preferences” → “Interpreter - Python”, then click button “Apply”, select your interpreter and then “OK”. Pydev  will rescan all packages and in some seconds all unresolved imports disappear.
Unfortunately I have to do these steps on every restart because Pydev always “forget” some packages after restart…
Aptana 3 Unresolved import - Python