Issue #19938: Re-enabled test_bug_1333982 in test_dis, which had been

disabled since 3.0 due to the changes in listcomp handling.

Lib/test/test_dis.py

@@ -6,6 +6,7 @@ import unittest
 import sys
 import dis
 import io
+import re
 
 class _C:
     def __init__(self, x):
@@ -89,26 +90,25 @@ def bug1333982(x=[]):
 
 dis_bug1333982 = """\
  %-4d         0 LOAD_CONST               1 (0)
-              3 JUMP_IF_TRUE            33 (to 39)
+              3 POP_JUMP_IF_TRUE        35
-              6 POP_TOP
+              6 LOAD_GLOBAL              0 (AssertionError)
-              7 LOAD_GLOBAL              0 (AssertionError)
+              9 LOAD_CONST               2 (<code object <listcomp> at 0x..., file "%s", line %d>)
-             10 BUILD_LIST               0
+             12 LOAD_CONST               3 ('bug1333982.<locals>.<listcomp>')
-             13 LOAD_FAST                0 (x)
+             15 MAKE_FUNCTION            0
-             16 GET_ITER
+             18 LOAD_FAST                0 (x)
-        >>   17 FOR_ITER                12 (to 32)
+             21 GET_ITER
-             20 STORE_FAST               1 (s)
+             22 CALL_FUNCTION            1 (1 positional, 0 keyword pair)
-             23 LOAD_FAST                1 (s)
-             26 LIST_APPEND              2
-             29 JUMP_ABSOLUTE           17
 
- %-4d   >>   32 LOAD_CONST               2 (1)
+ %-4d        25 LOAD_CONST               4 (1)
-             35 BINARY_ADD
+             28 BINARY_ADD
-             36 RAISE_VARARGS            2
+             29 CALL_FUNCTION            1 (1 positional, 0 keyword pair)
-        >>   39 POP_TOP
+             32 RAISE_VARARGS            1
 
- %-4d        40 LOAD_CONST               0 (None)
+ %-4d   >>   35 LOAD_CONST               0 (None)
-             43 RETURN_VALUE
+             38 RETURN_VALUE
 """ % (bug1333982.__code__.co_firstlineno + 1,
+       __file__,
+       bug1333982.__code__.co_firstlineno + 1,
        bug1333982.__code__.co_firstlineno + 2,
        bug1333982.__code__.co_firstlineno + 3)
 
@@ -193,8 +193,13 @@ class DisTests(unittest.TestCase):
     def do_disassembly_test(self, func, expected):
         lines = self.get_disassembly(func)
         expected = expected.splitlines()
-        if expected != lines:
+        if expected == lines:
-            self.fail(
+            return
+        else:
+            lines = [re.sub('0x[0-9A-Fa-f]+', '0x...', l) for l in lines]
+            if expected == lines:
+                return
+        self.fail(
                 "events did not match expectation:\n" +
                 "\n".join(difflib.ndiff(expected,
                                         lines)))
@@ -217,18 +222,13 @@ class DisTests(unittest.TestCase):
     def test_bug_708901(self):
         self.do_disassembly_test(bug708901, dis_bug708901)
 
-    # Test has been disabled due to change in the way
-    # list comps are handled. The byte code now includes
-    # a memory address and a file location, so they change from
-    # run to run.
-    @unittest.skip('disabled due to a change in the way list comps are handled')
     def test_bug_1333982(self):
-        # XXX: re-enable this test!
         # This one is checking bytecodes generated for an `assert` statement,
         # so fails if the tests are run with -O.  Skip this test then.
+        if not __debug__:
+            self.skipTest('need asserts, run without -O')
 
-        if __debug__:
+        self.do_disassembly_test(bug1333982, dis_bug1333982)
-            self.do_disassembly_test(bug1333982, dis_bug1333982)
 
     def test_big_linenos(self):
         def func(count):
@@ -451,8 +451,5 @@ class CodeInfoTests(unittest.TestCase):
         self.assertEqual(dis.pretty_flags(0), '0x0')
 
 
-def test_main():
-    run_unittest(DisTests, CodeInfoTests)
-
 if __name__ == "__main__":
-    test_main()
+    unittest.main()

Misc/NEWS

@@ -182,6 +182,9 @@ IDLE
 Tests
 -----
 
+- Issue #19938: Re-enabled test_bug_1333982 in test_dis, which had been
+  disabled since 3.0 due to the changes in listcomp handling.
+
 - Issue #19320: test_tcl no longer fails when wantobjects is false.
 
 - Issue #19683: Removed empty tests from test_minidom.  Patch by Ajitesh Gupta.