Only tell the user about %paste in the terminal shell.

IPython/core/interactiveshell.py

@@ -1605,6 +1605,10 b' class InteractiveShell(SingletonConfigurable, Magic):'
                     value = msg, (filename, lineno, offset, line)
         stb = self.SyntaxTB.structured_traceback(etype, value, [])
         self._showtraceback(etype, value, stb)
+    
+    # This is overridden in TerminalInteractiveShell to show a message about
+    # the %paste magic.
+    showindentationerror = showsyntaxerror
 
     #-------------------------------------------------------------------------
     # Things related to readline
@@ -2274,8 +2278,7 b' class InteractiveShell(SingletonConfigurable, Magic):'
                     try:
                         code_ast = ast.parse(cell, filename=cell_name)
                     except IndentationError:
-                        self.showsyntaxerror()
-                        print("If you want to paste code into IPython, try the %paste magic function.")
+                        self.showindentationerror()
                         self.execution_count += 1
                         return None
                     except (OverflowError, SyntaxError, ValueError, TypeError,

IPython/frontend/terminal/interactiveshell.py

@@ -588,6 +588,10 b' class TerminalInteractiveShell(InteractiveShell):'
             write("## -- End pasted text --\n")
             
         self._execute_block(block, par)
+    
+    def showindentationerror(self):
+        super(TerminalInteractiveShell, self).showindentationerror()
+        print("If you want to paste code into IPython, try the %paste magic function.")
 
 
 InteractiveShellABC.register(TerminalInteractiveShell)