Merged revisions 62873,62887,62892-62896,62904 via svnmerge from

svn+ssh://pythondev@svn.python.org/python/trunk

........
  r62873 | raymond.hettinger | 2008-05-08 12:18:13 -0500 (Thu, 08 May 2008) | 1 line

  Issue 2778.  Document the temporary frozenset swap in __contains__(), remove(), and discard().
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  r62887 | brett.cannon | 2008-05-08 14:50:51 -0500 (Thu, 08 May 2008) | 5 lines

  Make test.test_support.catch_warning() take an argument specifying if any
  triggered warnings should be captured. This allows the context manager to be
  used to just prevent the internal state of the 'warnings' framework and thus
  allow triggered warnings to be displayed.
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  r62892 | brett.cannon | 2008-05-08 15:20:24 -0500 (Thu, 08 May 2008) | 4 lines

  Fix a bug introduced by the addition of the 'record' argument to
  test.test_support.catch_warning() where showwarning() was not being set
  properly.
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  r62893 | brett.cannon | 2008-05-08 15:20:54 -0500 (Thu, 08 May 2008) | 2 lines

  Document the 'record' argument for test.test_support.catch_warning().
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  r62894 | brett.cannon | 2008-05-08 15:23:06 -0500 (Thu, 08 May 2008) | 4 lines

  Fix sys.flags to properly expose bytes_warning.

  Closes issue #2790.
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  r62895 | brett.cannon | 2008-05-08 15:23:54 -0500 (Thu, 08 May 2008) | 2 lines

  Add a missing entry on  the fix for issue #2790.
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  r62896 | brett.cannon | 2008-05-08 15:24:43 -0500 (Thu, 08 May 2008) | 2 lines

  Add test.test_support.catch_warning()'s new argument.
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  r62904 | benjamin.peterson | 2008-05-08 17:09:54 -0500 (Thu, 08 May 2008) | 2 lines

  Replace instances of os.path.walk with os.walk
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1 files changed, 18 insertions, 4 deletions

diff --git a/Lib/test/test_support.py b/Lib/test/test_support.py
index 431b66b..92592eb 100644
--- a/Lib/test/test_support.py
+++ b/Lib/test/test_support.py
@@ -37,6 +37,19 @@ class ResourceDenied(TestSkipped):
     and unexpected skips.
     """
 
+def import_module(name, deprecated=False):
+    """Import the module to be tested, raising TestSkipped if it is not
+    available."""
+    with catch_warning(record=False):
+        if deprecated:
+            warnings.filterwarnings("ignore", ".+ module", DeprecationWarning)
+        try:
+            module = __import__(name, level=0)
+        except ImportError:
+            raise TestSkipped("No module named " + name)
+        else:
+            return module
+
 verbose = 1              # Flag set to 0 by regrtest.py
 use_resources = None     # Flag set to [] by regrtest.py
 max_memuse = 0           # Disable bigmem tests (they will still be run with
@@ -373,7 +386,7 @@ class WarningMessage(object):
 
 
 @contextlib.contextmanager
-def catch_warning(module=warnings):
+def catch_warning(module=warnings, record=True):
     """
     Guard the warnings filter from being permanently changed and record the
     data of the last warning that has been issued.
@@ -384,12 +397,13 @@ def catch_warning(module=warnings):
             warnings.warn("foo")
             assert str(w.message) == "foo"
     """
-    warning_obj = WarningMessage()
     original_filters = module.filters[:]
     original_showwarning = module.showwarning
-    module.showwarning = warning_obj._showwarning
+    if record:
+        warning_obj = WarningMessage()
+        module.showwarning = warning_obj._showwarning
     try:
-        yield warning_obj
+        yield warning_obj if record else None
     finally:
         module.showwarning = original_showwarning
         module.filters = original_filters