diff --git a/jedi/api.py b/jedi/api.py
index e2631507..9f1fdeea 100644
--- a/jedi/api.py
+++ b/jedi/api.py
@@ -468,6 +468,25 @@ class Script(object):
         api_classes._clear_caches()
 
 
+def defined_names(source, source_path=None, source_encoding='utf-8'):
+    """
+    Get all definitions in `source` sorted by its position.
+
+    This functions can be used for listing functions, classes and
+    data defined in a file.  This can be useful if you want to list
+    them in "sidebar".  Each element in the returned list also has
+    `defined_names` method which can be used to get sub-definitions
+    (e.g., methods in class).
+
+    :rtype: list of api_classes.Definition
+    """
+    parser = parsing.Parser(
+        modules.source_to_unicode(source, source_encoding),
+        module_path=source_path,
+    )
+    return api_classes.defined_names(parser.scope)
+
+
 def set_debug_function(func_cb=debug.print_to_stdout, warnings=True,
                                             notices=True, speed=True):
     """
diff --git a/jedi/api_classes.py b/jedi/api_classes.py
index 3a966609..a84c7fe8 100644
--- a/jedi/api_classes.py
+++ b/jedi/api_classes.py
@@ -8,7 +8,7 @@ import re
 import os
 import warnings
 
-from _compatibility import unicode
+from _compatibility import unicode, next
 import cache
 import dynamic
 import recursion
@@ -58,6 +58,9 @@ class BaseDefinition(object):
     def __init__(self, definition, start_pos):
         self.start_pos = start_pos
         self.definition = definition
+        """
+        An instance of :class:`jedi.parsing_representation.Base` subclass.
+        """
         self.is_keyword = isinstance(definition, keywords.Keyword)
 
         # generate a path to the definition
@@ -271,6 +274,40 @@ class Definition(BaseDefinition):
     def __init__(self, definition):
         super(Definition, self).__init__(definition, definition.start_pos)
 
+    @property
+    def name(self):
+        """
+        Name of variable/function/class/module.
+
+        For example, for ``x = None`` it returns ``'x'``.
+
+        :rtype: str or None
+        """
+        d = self.definition
+        if isinstance(d, er.InstanceElement):
+            d = d.var
+
+        if isinstance(d, pr.Name):
+            return d.names[-1] if d.names else None
+        elif isinstance(d, er.Array):
+            return unicode(d.type)
+        elif isinstance(d, (pr.Class, er.Class, er.Instance,
+                            er.Function, pr.Function)):
+            return unicode(d.name)
+        elif isinstance(d, pr.Module):
+            return self.module_name
+        elif isinstance(d, pr.Import):
+            try:
+                return d.get_defined_names()[0].names[-1]
+            except (AttributeError, IndexError):
+                return None
+        elif isinstance(d, pr.Statement):
+            try:
+                return d.assignment_details[0][1].values[0][0].name.names[-1]
+            except IndexError:
+                return None
+        return None
+
     @property
     def description(self):
         """
@@ -317,6 +354,32 @@ class Definition(BaseDefinition):
             position = ''
         return "%s:%s%s" % (self.module_name, self.description, position)
 
+    def defined_names(self):
+        """
+        List sub-definitions (e.g., methods in class).
+
+        :rtype: list of Definition
+        """
+        d = self.definition
+        if isinstance(d, er.InstanceElement):
+            d = d.var
+        if isinstance(d, pr.Name):
+            d = d.parent
+        return defined_names(d)
+
+
+def defined_names(scope):
+    """
+    List sub-definitions (e.g., methods in class).
+
+    :type scope: Scope
+    :rtype: list of Definition
+    """
+    pair = next(evaluate.get_names_of_scope(
+        scope, star_search=False, include_builtin=False), None)
+    names = pair[1] if pair else []
+    return [Definition(d) for d in sorted(names, key=lambda s: s.start_pos)]
+
 
 class RelatedName(BaseDefinition):
     """TODO: document this"""
diff --git a/jedi/evaluate.py b/jedi/evaluate.py
index 884a2ea6..4dd1dd88 100644
--- a/jedi/evaluate.py
+++ b/jedi/evaluate.py
@@ -153,6 +153,8 @@ def get_names_of_scope(scope, position=None, star_search=True,
     >>> pairs[2]                                        #doctest: +ELLIPSIS
     (<Module: ...builtin...>, [<Name: ...>, ...])
 
+    :rtype: [(pr.Scope, [pr.Name])]
+    :return: Return an generator that yields a pair of scope and names.
     """
     in_func_scope = scope
     non_flow = scope.get_parent_until(pr.Flow, reverse=True)
diff --git a/test/regression.py b/test/regression.py
index 8f01ea14..70d25d70 100755
--- a/test/regression.py
+++ b/test/regression.py
@@ -391,6 +391,60 @@ class TestFeature(TestBase):
             self.assertEqual(quick_values, real_values)
 
 
+class TestGetDefinitions(TestBase):
+
+    def test_get_definitions_flat(self):
+        definitions = api.defined_names("""
+        import module
+        class Class:
+            pass
+        def func():
+            pass
+        data = None
+        """)
+        self.assertEqual([d.name for d in definitions],
+                         ['module', 'Class', 'func', 'data'])
+
+    def test_dotted_assignment(self):
+        definitions = api.defined_names("""
+        x = Class()
+        x.y.z = None
+        """)
+        self.assertEqual([d.name for d in definitions],
+                         ['x'])
+
+    def test_multiple_assignment(self):
+        definitions = api.defined_names("""
+        x = y = None
+        """)
+        self.assertEqual([d.name for d in definitions],
+                         ['x', 'y'])
+
+    def test_multiple_imports(self):
+        definitions = api.defined_names("""
+        from module import a, b
+        from another_module import *
+        """)
+        self.assertEqual([d.name for d in definitions],
+                         ['a', 'b'])
+
+    def test_nested_definitions(self):
+        definitions = api.defined_names("""
+        class Class:
+            def f():
+                pass
+            def g():
+                pass
+        """)
+        self.assertEqual([d.name for d in definitions],
+                         ['Class'])
+        subdefinitions = definitions[0].defined_names()
+        self.assertEqual([d.name for d in subdefinitions],
+                         ['f', 'g'])
+        self.assertEqual([d.full_name for d in subdefinitions],
+                         ['Class.f', 'Class.g'])
+
+
 class TestSpeed(TestBase):
     def _check_speed(time_per_run, number=4, run_warm=True):
         """ Speed checks should typically be very tolerant. Some machines are