Somehow the virtual env prefix is set in VIM.

This basically corrupts VIM's Python, because it might be having a differnet prefix (Python 3.6) than sys path. I don't know who came up with this - probably it's just how Python loads venvs - but it's definitely not good. Fortunately we can just reset it and be happy.

pythonx/jedi_vim.py

@@ -25,6 +25,15 @@ else:
     ELLIPSIS = u"…"
 
 
+try:
+    sys.prefix = sys.base_prefix
+    sys.exec_prefix = sys.base_exec_prefix
+except AttributeError:
+    # Somehow sys.prefix is set in combination with VIM and virtualenvs.
+    # However the sys path is not affected. Just reset it to the normal value.
+    pass
+
+
 class PythonToVimStr(unicode):
     """ Vim has a different string implementation of single quotes """
     __slots__ = []