diff --git a/ptpython/key_bindings.py b/ptpython/key_bindings.py
index b01762e6..110b5b35 100644
--- a/ptpython/key_bindings.py
+++ b/ptpython/key_bindings.py
@@ -1,3 +1,5 @@
+from jedi import Interpreter
+from prompt_toolkit.completion import CompleteEvent
 from prompt_toolkit.application import get_app
 from prompt_toolkit.document import Document
 from prompt_toolkit.enums import DEFAULT_BUFFER
@@ -6,10 +8,13 @@
     emacs_insert_mode,
     emacs_mode,
     has_focus,
+    has_completions,
+    completion_is_selected,
     has_selection,
     vi_insert_mode,
 )
 from prompt_toolkit.key_binding import KeyBindings
+from prompt_toolkit.key_binding.key_processor import KeyPress
 from prompt_toolkit.keys import Keys
 
 from .utils import document_is_multiline_python
@@ -201,6 +206,87 @@ def _(event):
         " Abort when Control-C has been pressed. "
         event.app.exit(exception=KeyboardInterrupt, style="class:aborting")
 
+    def is_callable(text=""):
+        completions = Interpreter(text, [locals()]).complete()
+        match = next((i for i in completions if i.name == text), None)
+        return match.type in ("class", "function") if match else None
+
+    @Condition
+    def tac():
+        return python_input.tab_apply_completion
+
+    insert_mode = vi_insert_mode | emacs_insert_mode
+    focused_insert =  insert_mode & has_focus(DEFAULT_BUFFER)
+    shown_not_selected = has_completions & ~completion_is_selected
+    alt_enter = [KeyPress(Keys.Escape), KeyPress(Keys.Enter)]
+
+    # apply selected completion
+    @handle('c-j', filter=focused_insert & completion_is_selected & tac)
+    @handle("enter", filter=focused_insert & completion_is_selected & tac)
+    def _(event):
+        b = event.current_buffer
+        text = b.text
+        completion = b.complete_state.current_completion
+        if is_callable(completion.text):
+            b.insert_text("()")
+            b.cursor_left()
+        if text == b.text:
+            event.cli.key_processor.feed_multiple(alt_enter)
+
+    # apply first completion option when completion menu is showing
+    @handle('c-j', filter=focused_insert & shown_not_selected & tac)
+    @handle("enter", filter=focused_insert & shown_not_selected & tac)
+    def _(event):
+        b = event.current_buffer
+        text = b.text
+        b.complete_next()
+        completion = b.complete_state.current_completion
+        b.apply_completion(completion)
+        if is_callable(completion.text):
+            b.insert_text("()")
+            b.cursor_left()
+        if text == b.text:
+            event.cli.key_processor.feed_multiple(alt_enter)
+
+    # apply completion if there is only one option, otherwise start completion
+    @handle("tab", filter=focused_insert & ~has_completions & tac)
+    @handle("c-space", filter=focused_insert & ~has_completions & tac)
+    def _(event):
+        b = event.current_buffer
+        complete_event = CompleteEvent(completion_requested=True)
+        completions = b.completer.get_completions(b.document, complete_event)
+        if len(completions) == 1:
+            completion = completions[0]
+            b.apply_completion(completion)
+            if is_callable(completion.text):
+                b.insert_text("()")
+                b.cursor_left()
+        else:
+            b.start_completion(insert_common_part=True)
+
+    # apply first completion option if completion menu is showing
+    @handle("tab", filter=focused_insert & shown_not_selected & tac)
+    @handle("c-space", filter=focused_insert & shown_not_selected & tac)
+    def _(event):
+        b = event.current_buffer
+        b.complete_next()
+        completion = b.complete_state.current_completion
+        b.apply_completion(completion)
+        if is_callable(completion.text):
+            b.insert_text("()")
+            b.cursor_left()
+
+    # apply selected completion option
+    @handle("tab", filter=focused_insert & completion_is_selected & tac)
+    @handle("c-space", filter=focused_insert & completion_is_selected & tac)
+    def _(event):
+        b = event.current_buffer
+        completion = b.complete_state.current_completion
+        b.apply_completion(completion)
+        if is_callable(completion.text):
+            b.insert_text("()")
+            b.cursor_left()
+
     return bindings
 
 
diff --git a/ptpython/python_input.py b/ptpython/python_input.py
index c119e391..f7c865a0 100644
--- a/ptpython/python_input.py
+++ b/ptpython/python_input.py
@@ -234,6 +234,7 @@ def __init__(
         self.enable_system_bindings: bool = True
         self.enable_input_validation: bool = True
         self.enable_auto_suggest: bool = False
+        self.tab_apply_completion: bool = True
         self.enable_mouse_support: bool = False
         self.enable_history_search: bool = False  # When True, like readline, going
         # back in history will filter the