Make InterpreterEnvironment public

jedi/__init__.py

@@ -40,7 +40,7 @@ from jedi.api import Script, Interpreter, set_debug_function, \
 from jedi import settings
 from jedi.api.environment import find_virtualenvs, find_system_environments, \
     get_default_environment, InvalidPythonEnvironment, create_environment, \
-    get_system_environment
+    get_system_environment, InterpreterEnvironment
 from jedi.api.exceptions import InternalError
 # Finally load the internal plugins. This is only internal.
 from jedi.plugins import registry