use module completion on %aimport

IPython/core/completerlib.py

@@ -223,7 +223,7 b' def module_completion(line):'
         return ['import ']
 
     # 'from xy<tab>' or 'import xy<tab>'
-    if nwords < 3 and (words[0] in ['import','from']) :
+    if nwords < 3 and (words[0] in {'%aimport', 'import', 'from'}) :
         if nwords == 1:
             return get_root_modules()
         mod = words[1].split('.')

IPython/core/interactiveshell.py

@@ -2103,6 +2103,7 b' class InteractiveShell(SingletonConfigurable):'
 
         self.set_hook('complete_command', module_completer, str_key = 'import')
         self.set_hook('complete_command', module_completer, str_key = 'from')
+        self.set_hook('complete_command', module_completer, str_key = '%aimport')
         self.set_hook('complete_command', magic_run_completer, str_key = '%run')
         self.set_hook('complete_command', cd_completer, str_key = '%cd')
         self.set_hook('complete_command', reset_completer, str_key = '%reset')