Fix "super" objects pretty printing in PyPy

In PyPy there's no __self__ attribute for super(.) objects. As objects
always have a __repr__, the found alternative was to use its curried
argument.

Previously, only the class name was verified as part of the result,
now the tests include a regex.

IPython/lib/pretty.py

@@ -85,7 +85,7 b' import re'
 import datetime
 from collections import deque
 
-from IPython.utils.py3compat import PY3, cast_unicode, string_types
+from IPython.utils.py3compat import PY3, PYPY, cast_unicode, string_types
 from IPython.utils.encoding import get_stream_enc
 
 from io import StringIO
@@ -632,7 +632,11 b' def _super_pprint(obj, p, cycle):'
     p.pretty(obj.__thisclass__)
     p.text(',')
     p.breakable()
-    p.pretty(obj.__self__)
+    if PYPY: # In PyPy, super() objects doesn't have __self__ attributes
+        dself = obj.__repr__.__self__
+        p.pretty(None if dself is obj else dself)
+    else:
+        p.pretty(obj.__self__)
     p.end_group(8, '>')
 
 

IPython/lib/tests/test_pretty.py

@@ -188,12 +188,14 b' class SB(SA):'
     pass
 
 def test_super_repr():
+    # "<super: module_name.SA, None>"
     output = pretty.pretty(super(SA))
-    nt.assert_in("SA", output)
+    nt.assert_regexp_matches(output, r"<super: \S+.SA, None>")
 
+    # "<super: module_name.SA, <module_name.SB at 0x...>>"
     sb = SB()
     output = pretty.pretty(super(SA, sb))
-    nt.assert_in("SA", output)
+    nt.assert_regexp_matches(output, r"<super: \S+.SA,\s+<\S+.SB at 0x\S+>>")
 
 
 def test_long_list():