Issue #4677: add two list comprehension tests to pybench.

Misc/NEWS

@@ -190,6 +190,11 @@ Library
 - Issue #4730: Fixed the cPickle module to handle correctly astral characters
   when protocol 0 is used.
 
+Tools/Demos
+-----------
+
+- Issue #4677: add two list comprehension tests to pybench.
+
 Build
 -----
 

Tools/pybench/Lists.py

@@ -293,3 +293,58 @@ class SmallLists(Test):
 
         for i in xrange(self.rounds):
             pass
+
+class SimpleListComprehensions(Test):
+
+    version = 2.0
+    operations = 6
+    rounds = 20000
+
+    def test(self):
+
+        n = range(10) * 10
+
+        for i in xrange(self.rounds):
+            l = [x for x in n]
+            l = [x for x in n if x]
+            l = [x for x in n if not x]
+
+            l = [x for x in n]
+            l = [x for x in n if x]
+            l = [x for x in n if not x]
+
+    def calibrate(self):
+
+        n = range(10) * 10
+
+        for i in xrange(self.rounds):
+            pass
+
+class NestedListComprehensions(Test):
+
+    version = 2.0
+    operations = 6
+    rounds = 20000
+
+    def test(self):
+
+        m = range(10)
+        n = range(10)
+
+        for i in xrange(self.rounds):
+            l = [x for x in n for y in m]
+            l = [y for x in n for y in m]
+
+            l = [x for x in n for y in m if y]
+            l = [y for x in n for y in m if x]
+
+            l = [x for x in n for y in m if not y]
+            l = [y for x in n for y in m if not x]
+
+    def calibrate(self):
+
+        m = range(10)
+        n = range(10)
+
+        for i in xrange(self.rounds):
+            pass