Using PyDev in Eclipse whenever I start typing code in the editor, I get a code completion suggestion of \"com/python/pydev/analysis/CtxInsensitiveImportComplProposal\". It does
PyDev 5.3 requires Eclipse 4.6 (Neon)... So, if you upgrade your Eclipse installation it should work.
If you can't upgrade, please keep using an older version of PyDev too.