Remove underscore_memoization caching method

jedi/cache.py

@@ -20,38 +20,6 @@ from parso.cache import parser_cache
 _time_caches = {}
 
 
-def underscore_memoization(func):
-    """
-    Decorator for methods::
-
-        class A(object):
-            def x(self):
-                if self._x:
-                    self._x = 10
-                return self._x
-
-    Becomes::
-
-        class A(object):
-            @underscore_memoization
-            def x(self):
-                return 10
-
-    A now has an attribute ``_x`` written by this decorator.
-    """
-    name = '_' + func.__name__
-
-    def wrapper(self):
-        try:
-            return getattr(self, name)
-        except AttributeError:
-            result = func(self)
-            setattr(self, name, result)
-            return result
-
-    return wrapper
-
-
 def clear_time_caches(delete_all=False):
     """ Jedi caches many things, that should be completed after each completion
     finishes.