Using python2.7 reports error on "import builtins not found". The file introspect.py of kdevelop-python imports builtins which is contained in dev-python/future.
I am wondering how you can use kdevelop-python with py2.7 when it has a >=python-3.4 dependency. Full error message please.
you can write python code in kdevelop (build with python3.4) and let it run under another python (e.g. 2.7) instance. The code completion parser for binary packages can be started manually with the python instance of your choice... Anyway, talking to upstream revealed some more compatibility issues not that easy fixable. Upstream self told me python2.7 issues will not be handled in foreseeable future and kdevelop5 is intended for python3.4+ development only. sorry for jumping the gun mark this as not a bug