Remove deprecated banner parameter

All of that was deprecated at or before 5.0

IPython/core/completer.py

@@ -591,7 +591,7 b' class Completer(Configurable):'
 
     greedy = Bool(False,
         help="""Activate greedy completion
-        PENDING DEPRECTION. this is now mostly taken care of with Jedi.
+        PENDING DEPRECATION. this is now mostly taken care of with Jedi.
 
         This will enable completion on elements of lists, results of function calls, etc.,
         but can be unsafe because the code is actually evaluated on TAB.

IPython/core/magics/config.py

@@ -82,7 +82,7 b' class ConfigMagics(Magics):'
                 Current: False
             IPCompleter.greedy=<Bool>
                 Activate greedy completion
-                        PENDING DEPRECTION. this is now mostly taken care of with Jedi.
+                        PENDING DEPRECATION. this is now mostly taken care of with Jedi.
                         This will enable completion on elements of lists, results of function calls, etc.,
                         but can be unsafe because the code is actually evaluated on TAB.
                 Current: False

IPython/terminal/interactiveshell.py

@@ -51,7 +51,6 b' from .prompts import Prompts, ClassicPrompts, RichPromptDisplayHook'
 from .ptutils import IPythonPTCompleter, IPythonPTLexer
 from .shortcuts import create_ipython_shortcuts
 
-DISPLAY_BANNER_DEPRECATED = object()
 PTK3 = ptk_version.startswith('3.')
 
 
@@ -579,11 +578,7 b' class TerminalInteractiveShell(InteractiveShell):'
 
     rl_next_input = None
 
-    def interact(self, display_banner=DISPLAY_BANNER_DEPRECATED):
-
-        if display_banner is not DISPLAY_BANNER_DEPRECATED:
-            warn('interact `display_banner` argument is deprecated since IPython 5.0. Call `show_banner()` if needed.', DeprecationWarning, stacklevel=2)
-
+    def interact(self):
         self.keep_running = True
         while self.keep_running:
             print(self.separate_in, end='')
@@ -599,11 +594,9 b' class TerminalInteractiveShell(InteractiveShell):'
                 if code:
                     self.run_cell(code, store_history=True)
 
-    def mainloop(self, display_banner=DISPLAY_BANNER_DEPRECATED):
+    def mainloop(self):
         # An extra layer of protection in case someone mashing Ctrl-C breaks
         # out of our internal code.
-        if display_banner is not DISPLAY_BANNER_DEPRECATED:
-            warn('mainloop `display_banner` argument is deprecated since IPython 5.0. Call `show_banner()` if needed.', DeprecationWarning, stacklevel=2)
         while True:
             try:
                 self.interact()