Revert "Backport PR #12207 on branch 7.x (Bump jedi to at least 0.16.0 and fix deprecated function usage)"

IPython/core/completer.py

@@ -988,8 +988,7 b' def _make_signature(completion)-> str:'
 
     """
 
-    return '(%s)'% ', '.join([f for f in (_formatparamchildren(p) for signature in completion.get_signatures()
-                                          for p in signature.defined_names()) if f])
+    return '(%s)'% ', '.join([f for f in (_formatparamchildren(p) for p in completion.params) if f])
 
 class IPCompleter(Completer):
     """Extension of the completer class with IPython-specific features"""
@@ -1399,7 +1398,7 b' class IPCompleter(Completer):'
         if not try_jedi:
             return []
         try:
-            return filter(completion_filter, interpreter.complete())
+            return filter(completion_filter, interpreter.completions())
         except Exception as e:
             if self.debug:
                 return [_FakeJediCompletion('Oops Jedi has crashed, please report a bug with the following:\n"""\n%s\ns"""' % (e))]

setup.py

@@ -187,7 +187,7 b' extras_require = dict('
 
 install_requires = [
     'setuptools>=18.5',
-    'jedi>=0.16',
+    'jedi>=0.10',
     'decorator',
     'pickleshare',
     'traitlets>=4.2',