Merged revisions 60481,60485,60489-60492,60494-60496,60498-60499,60501-60503,60505-60506,60508-60509,60523-60524,60532,60543,60545,60547-60548,60552,60554,60556-60559,60561-60562,60569,60571-60572,60574,60576-60583,60585-60586,60589,60591,60594-60595,60597-60598,60600-60601,60606-60612,60615,60617,60619-60621,60623-60625,60627-60629,60631,60633,60635,60647,60650,60652,60654,60656,60658-60659,60664-60666,60668-60670,60672,60676,60678-60695 via svnmerge from

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

........
  r60679 | raymond.hettinger | 2008-02-09 02:18:42 +0100 (Sat, 09 Feb 2008) | 1 line

  Make ABC containers inherit as documented.
........
  r60684 | raymond.hettinger | 2008-02-09 04:34:52 +0100 (Sat, 09 Feb 2008) | 1 line

  Merge with r60683.
........
  r60687 | raymond.hettinger | 2008-02-09 05:37:49 +0100 (Sat, 09 Feb 2008) | 1 line

  Add -3 warnings that set.copy(), dict.copy(), and defaultdict.copy() will go away in Py3.x
........
  r60689 | raymond.hettinger | 2008-02-09 11:04:19 +0100 (Sat, 09 Feb 2008) | 1 line

  Metaclass declaration is inherited
........
  r60691 | raymond.hettinger | 2008-02-09 11:06:20 +0100 (Sat, 09 Feb 2008) | 1 line

  Temporarily disable this test. It's been broken for a week.
........
  r60695 | nick.coghlan | 2008-02-09 16:28:09 +0100 (Sat, 09 Feb 2008) | 1 line

  Issue 2021: Allow NamedTemporaryFile and SpooledTemporaryFile to be used as context managers. (The NamedTemporaryFile fix should be considered for backporting to 2.5)
........

1 files changed, 33 insertions, 2 deletions

diff --git a/Lib/tempfile.py b/Lib/tempfile.py
index d725a9d..4f27f61 100644
--- a/Lib/tempfile.py
+++ b/Lib/tempfile.py
@@ -363,6 +363,7 @@ def mktemp(suffix="", prefix=template, dir=None):
 
     raise IOError(_errno.EEXIST, "No usable temporary filename found")
 
+
 class _TemporaryFileWrapper:
     """Temporary file wrapper
 
@@ -378,17 +379,25 @@ class _TemporaryFileWrapper:
         self.delete = delete
 
     def __getattr__(self, name):
+        # Attribute lookups are delegated to the underlying file
+        # and cached for non-numeric results
+        # (i.e. methods are cached, closed and friends are not)
         file = self.__dict__['file']
         a = getattr(file, name)
-        if type(a) != type(0):
+        if not isinstance(a, int):
             setattr(self, name, a)
         return a
 
+    # The underlying __enter__ method returns the wrong object
+    # (self.file) so override it to return the wrapper
+    def __enter__(self):
+        self.file.__enter__()
+        return self
+
     # NT provides delete-on-close as a primitive, so we don't need
     # the wrapper to do anything special.  We still use it so that
     # file.name is useful (i.e. not "(fdopen)") with NamedTemporaryFile.
     if _os.name != 'nt':
-
         # Cache the unlinker so we don't get spurious errors at
         # shutdown when the module-level "os" is None'd out.  Note
         # that this must be referenced as self.unlink, because the
@@ -406,6 +415,14 @@ class _TemporaryFileWrapper:
         def __del__(self):
             self.close()
 
+        # Need to trap __exit__ as well to ensure the file gets
+        # deleted when used in a with statement
+        def __exit__(self, exc, value, tb):
+            result = self.file.__exit__(exc, value, tb)
+            self.close()
+            return result
+
+
 def NamedTemporaryFile(mode='w+b', buffering=-1, encoding=None,
                        newline=None, suffix="", prefix=template,
                        dir=None, delete=True):
@@ -523,6 +540,20 @@ class SpooledTemporaryFile:
 
         self._rolled = True
 
+    # The method caching trick from NamedTemporaryFile
+    # won't work here, because _file may change from a
+    # _StringIO instance to a real file. So we list
+    # all the methods directly.
+
+    # Context management protocol
+    def __enter__(self):
+        if self._file.closed:
+            raise ValueError("Cannot enter context with closed file")
+        return self
+
+    def __exit__(self, exc, value, tb):
+        self._file.close()
+
     # file protocol
     def __iter__(self):
         return self._file.__iter__()