SF patch 1631942 by Collin Winter:

(a) "except E, V" -> "except E as V"
(b) V is now limited to a simple name (local variable)
(c) V is now deleted at the end of the except block

bcppcompiler.py

@@ -115,7 +115,7 @@ class BCPPCompiler(CCompiler) :
                 # This needs to be compiled to a .res file -- do it now.
                 try:
                     self.spawn (["brcc32", "-fo", obj, src])
-                except DistutilsExecError, msg:
+                except DistutilsExecError as msg:
                     raise CompileError, msg
                 continue # the 'for' loop
 
@@ -139,7 +139,7 @@ class BCPPCompiler(CCompiler) :
                 self.spawn ([self.cc] + compile_opts + pp_opts +
                             [input_opt, output_opt] +
                             extra_postargs + [src])
-            except DistutilsExecError, msg:
+            except DistutilsExecError as msg:
                 raise CompileError, msg
 
         return objects
@@ -164,7 +164,7 @@ class BCPPCompiler(CCompiler) :
                 pass                    # XXX what goes here?
             try:
                 self.spawn ([self.lib] + lib_args)
-            except DistutilsExecError, msg:
+            except DistutilsExecError as msg:
                 raise LibError, msg
         else:
             log.debug("skipping %s (up-to-date)", output_filename)
@@ -298,7 +298,7 @@ class BCPPCompiler(CCompiler) :
             self.mkpath (os.path.dirname (output_filename))
             try:
                 self.spawn ([self.linker] + ld_args)
-            except DistutilsExecError, msg:
+            except DistutilsExecError as msg:
                 raise LinkError, msg
 
         else:
@@ -391,7 +391,7 @@ class BCPPCompiler(CCompiler) :
                 self.mkpath(os.path.dirname(output_file))
             try:
                 self.spawn(pp_args)
-            except DistutilsExecError, msg:
+            except DistutilsExecError as msg:
                 print msg
                 raise CompileError, msg
 

command/register.py

@@ -284,11 +284,11 @@ Your selection [default 1]: ''',
         data = ''
         try:
             result = opener.open(req)
-        except urllib2.HTTPError, e:
+        except urllib2.HTTPError as e:
             if self.show_response:
                 data = e.fp.read()
             result = e.code, e.msg
-        except urllib2.URLError, e:
+        except urllib2.URLError as e:
             result = 500, str(e)
         else:
             if self.show_response:

command/sdist.py

@@ -333,7 +333,7 @@ class sdist (Command):
 
             try:
                 self.filelist.process_template_line(line)
-            except DistutilsTemplateError, msg:
+            except DistutilsTemplateError as msg:
                 self.warn("%s, line %d: %s" % (template.filename,
                                                template.current_line,
                                                msg))

command/upload.py

@@ -184,7 +184,7 @@ class upload(Command):
             http.putheader('Authorization', auth)
             http.endheaders()
             http.send(body)
-        except socket.error, e:
+        except socket.error as e:
             self.announce(str(e), log.ERROR)
             return
 

core.py

@@ -110,7 +110,7 @@ def setup (**attrs):
     # (ie. everything except distclass) to initialize it
     try:
         _setup_distribution = dist = klass(attrs)
-    except DistutilsSetupError, msg:
+    except DistutilsSetupError as msg:
         if 'name' not in attrs:
             raise SystemExit, "error in %s setup command: %s" % \
                   (attrs['name'], msg)
@@ -135,7 +135,7 @@ def setup (**attrs):
     # fault, so turn them into SystemExit to suppress tracebacks.
     try:
         ok = dist.parse_command_line()
-    except DistutilsArgError, msg:
+    except DistutilsArgError as msg:
         raise SystemExit, gen_usage(dist.script_name) + "\nerror: %s" % msg
 
     if DEBUG:
@@ -151,7 +151,7 @@ def setup (**attrs):
             dist.run_commands()
         except KeyboardInterrupt:
             raise SystemExit, "interrupted"
-        except (IOError, os.error), exc:
+        except (IOError, os.error) as exc:
             error = grok_environment_error(exc)
 
             if DEBUG:
@@ -161,7 +161,7 @@ def setup (**attrs):
                 raise SystemExit, error
 
         except (DistutilsError,
-                CCompilerError), msg:
+                CCompilerError) as msg:
             if DEBUG:
                 raise
             else:

cygwinccompiler.py

@@ -142,13 +142,13 @@ class CygwinCCompiler (UnixCCompiler):
             # gcc needs '.res' and '.rc' compiled to object files !!!
             try:
                 self.spawn(["windres", "-i", src, "-o", obj])
-            except DistutilsExecError, msg:
+            except DistutilsExecError as msg:
                 raise CompileError, msg
         else: # for other files use the C-compiler
             try:
                 self.spawn(self.compiler_so + cc_args + [src, '-o', obj] +
                            extra_postargs)
-            except DistutilsExecError, msg:
+            except DistutilsExecError as msg:
                 raise CompileError, msg
 
     def link (self,
@@ -379,7 +379,7 @@ def check_config_h():
         s = f.read()
         f.close()
 
-    except IOError, exc:
+    except IOError as exc:
         # if we can't read this file, we cannot say it is wrong
         # the compiler will complain later about this file as missing
         return (CONFIG_H_UNCERTAIN,

dir_util.py

@@ -75,7 +75,7 @@ def mkpath (name, mode=0777, verbose=0, dry_run=0):
             try:
                 os.mkdir(head)
                 created_dirs.append(head)
-            except OSError, exc:
+            except OSError as exc:
                 raise DistutilsFileError, \
                       "could not create '%s': %s" % (head, exc[-1])
 
@@ -142,7 +142,8 @@ def copy_tree (src, dst,
               "cannot copy tree '%s': not a directory" % src
     try:
         names = os.listdir(src)
-    except os.error, (errno, errstr):
+    except os.error as e:
+        (errno, errstr) = e
         if dry_run:
             names = []
         else:
@@ -209,7 +210,7 @@ def remove_tree (directory, verbose=0, dry_run=0):
             abspath = os.path.abspath(cmd[1])
             if abspath in _path_created:
                 del _path_created[abspath]
-        except (IOError, OSError), exc:
+        except (IOError, OSError) as exc:
             log.warn(grok_environment_error(
                     exc, "error removing %s: " % directory))
 

dist.py

@@ -398,7 +398,7 @@ Common commands: (see '--help-commands' for more)
                         setattr(self, opt, strtobool(val))
                     else:
                         setattr(self, opt, val)
-                except ValueError, msg:
+                except ValueError as msg:
                     raise DistutilsOptionError, msg
 
     # parse_config_files ()
@@ -515,7 +515,7 @@ Common commands: (see '--help-commands' for more)
         # it takes.
         try:
             cmd_class = self.get_command_class(command)
-        except DistutilsModuleError, msg:
+        except DistutilsModuleError as msg:
             raise DistutilsArgError, msg
 
         # Require that the command class be derived from Command -- want
@@ -917,7 +917,7 @@ Common commands: (see '--help-commands' for more)
                     raise DistutilsOptionError, \
                           ("error in %s: command '%s' has no such option '%s'"
                            % (source, command_name, option))
-            except ValueError, msg:
+            except ValueError as msg:
                 raise DistutilsOptionError, msg
 
     def reinitialize_command (self, command, reinit_subcommands=0):

emxccompiler.py

@@ -79,13 +79,13 @@ class EMXCCompiler (UnixCCompiler):
             # gcc requires '.rc' compiled to binary ('.res') files !!!
             try:
                 self.spawn(["rc", "-r", src])
-            except DistutilsExecError, msg:
+            except DistutilsExecError as msg:
                 raise CompileError, msg
         else: # for other files use the C-compiler
             try:
                 self.spawn(self.compiler_so + cc_args + [src, '-o', obj] +
                            extra_postargs)
-            except DistutilsExecError, msg:
+            except DistutilsExecError as msg:
                 raise CompileError, msg
 
     def link (self,
@@ -275,7 +275,7 @@ def check_config_h():
         s = f.read()
         f.close()
 
-    except IOError, exc:
+    except IOError as exc:
         # if we can't read this file, we cannot say it is wrong
         # the compiler will complain later about this file as missing
         return (CONFIG_H_UNCERTAIN,

fancy_getopt.py

@@ -256,7 +256,7 @@ class FancyGetopt:
         short_opts = string.join(self.short_opts)
         try:
             opts, args = getopt.getopt(args, short_opts, self.long_opts)
-        except getopt.error, msg:
+        except getopt.error as msg:
             raise DistutilsArgError, msg
 
         for opt, val in opts:

file_util.py

@@ -32,27 +32,31 @@ def _copy_file_contents (src, dst, buffer_size=16*1024):
     try:
         try:
             fsrc = open(src, 'rb')
-        except os.error, (errno, errstr):
+        except os.error as e:
+            (errno, errstr) = e
             raise DistutilsFileError, \
                   "could not open '%s': %s" % (src, errstr)
 
         if os.path.exists(dst):
             try:
                 os.unlink(dst)
-            except os.error, (errno, errstr):
+            except os.error as e:
+                (errno, errstr) = e
                 raise DistutilsFileError, \
                       "could not delete '%s': %s" % (dst, errstr)
 
         try:
             fdst = open(dst, 'wb')
-        except os.error, (errno, errstr):
+        except os.error as e:
+            (errno, errstr) = e
             raise DistutilsFileError, \
                   "could not create '%s': %s" % (dst, errstr)
 
         while 1:
             try:
                 buf = fsrc.read(buffer_size)
-            except os.error, (errno, errstr):
+            except os.error as e:
+                (errno, errstr) = e
                 raise DistutilsFileError, \
                       "could not read from '%s': %s" % (src, errstr)
 
@@ -61,7 +65,8 @@ def _copy_file_contents (src, dst, buffer_size=16*1024):
 
             try:
                 fdst.write(buf)
-            except os.error, (errno, errstr):
+            except os.error as e:
+                (errno, errstr) = e
                 raise DistutilsFileError, \
                       "could not write to '%s': %s" % (dst, errstr)
 
@@ -146,7 +151,7 @@ def copy_file (src, dst,
         import macostools
         try:
             macostools.copy(src, dst, 0, preserve_times)
-        except os.error, exc:
+        except os.error as exc:
             raise DistutilsFileError, \
                   "could not copy '%s' to '%s': %s" % (src, dst, exc[-1])
 
@@ -217,7 +222,8 @@ def move_file (src, dst,
     copy_it = 0
     try:
         os.rename(src, dst)
-    except os.error, (num, msg):
+    except os.error as e:
+        (num, msg) = e
         if num == errno.EXDEV:
             copy_it = 1
         else:
@@ -228,7 +234,8 @@ def move_file (src, dst,
         copy_file(src, dst)
         try:
             os.unlink(src)
-        except os.error, (num, msg):
+        except os.error as e:
+            (num, msg) = e
             try:
                 os.unlink(dst)
             except os.error:

msvccompiler.py

@@ -129,7 +129,7 @@ class MacroExpander:
                 self.set_macro("FrameworkSDKDir", net, "sdkinstallrootv1.1")
             else:
                 self.set_macro("FrameworkSDKDir", net, "sdkinstallroot")
-        except KeyError, exc: #
+        except KeyError as exc: #
             raise DistutilsPlatformError, \
                   ("""Python was built with Visual Studio 2003;
 extensions must be built with a compiler than can generate compatible binaries.
@@ -371,7 +371,7 @@ class MSVCCompiler (CCompiler) :
                 try:
                     self.spawn ([self.rc] + pp_opts +
                                 [output_opt] + [input_opt])
-                except DistutilsExecError, msg:
+                except DistutilsExecError as msg:
                     raise CompileError, msg
                 continue
             elif ext in self._mc_extensions:
@@ -400,7 +400,7 @@ class MSVCCompiler (CCompiler) :
                     self.spawn ([self.rc] +
                                 ["/fo" + obj] + [rc_file])
 
-                except DistutilsExecError, msg:
+                except DistutilsExecError as msg:
                     raise CompileError, msg
                 continue
             else:
@@ -414,7 +414,7 @@ class MSVCCompiler (CCompiler) :
                 self.spawn ([self.cc] + compile_opts + pp_opts +
                             [input_opt, output_opt] +
                             extra_postargs)
-            except DistutilsExecError, msg:
+            except DistutilsExecError as msg:
                 raise CompileError, msg
 
         return objects
@@ -440,7 +440,7 @@ class MSVCCompiler (CCompiler) :
                 pass                    # XXX what goes here?
             try:
                 self.spawn ([self.lib] + lib_args)
-            except DistutilsExecError, msg:
+            except DistutilsExecError as msg:
                 raise LibError, msg
 
         else:
@@ -519,7 +519,7 @@ class MSVCCompiler (CCompiler) :
             self.mkpath (os.path.dirname (output_filename))
             try:
                 self.spawn ([self.linker] + ld_args)
-            except DistutilsExecError, msg:
+            except DistutilsExecError as msg:
                 raise LinkError, msg
 
         else:

spawn.py

@@ -78,7 +78,7 @@ def _spawn_nt (cmd,
         # spawn for NT requires a full path to the .exe
         try:
             rc = os.spawnv(os.P_WAIT, executable, cmd)
-        except OSError, exc:
+        except OSError as exc:
             # this seems to happen when the command isn't found
             raise DistutilsExecError, \
                   "command '%s' failed: %s" % (cmd[0], exc[-1])
@@ -103,7 +103,7 @@ def _spawn_os2 (cmd,
         # spawnv for OS/2 EMX requires a full path to the .exe
         try:
             rc = os.spawnv(os.P_WAIT, executable, cmd)
-        except OSError, exc:
+        except OSError as exc:
             # this seems to happen when the command isn't found
             raise DistutilsExecError, \
                   "command '%s' failed: %s" % (cmd[0], exc[-1])
@@ -131,7 +131,7 @@ def _spawn_posix (cmd,
             #print "cmd[0] =", cmd[0]
             #print "cmd =", cmd
             exec_fn(cmd[0], cmd)
-        except OSError, e:
+        except OSError as e:
             sys.stderr.write("unable to execute %s: %s\n" %
                              (cmd[0], e.strerror))
             os._exit(1)
@@ -146,7 +146,7 @@ def _spawn_posix (cmd,
         while 1:
             try:
                 (pid, status) = os.waitpid(pid, 0)
-            except OSError, exc:
+            except OSError as exc:
                 import errno
                 if exc.errno == errno.EINTR:
                     continue

sysconfig.py

@@ -344,7 +344,7 @@ def _init_posix():
     try:
         filename = get_makefile_filename()
         parse_makefile(filename, g)
-    except IOError, msg:
+    except IOError as msg:
         my_msg = "invalid Python installation: unable to open %s" % filename
         if hasattr(msg, "strerror"):
             my_msg = my_msg + " (%s)" % msg.strerror
@@ -355,7 +355,7 @@ def _init_posix():
     try:
         filename = get_config_h_filename()
         parse_config_h(open(filename), g)
-    except IOError, msg:
+    except IOError as msg:
         my_msg = "invalid Python installation: unable to open %s" % filename
         if hasattr(msg, "strerror"):
             my_msg = my_msg + " (%s)" % msg.strerror

unixccompiler.py

@@ -162,7 +162,7 @@ class UnixCCompiler(CCompiler):
                 self.mkpath(os.path.dirname(output_file))
             try:
                 self.spawn(pp_args)
-            except DistutilsExecError, msg:
+            except DistutilsExecError as msg:
                 raise CompileError, msg
 
     def _compile(self, obj, src, ext, cc_args, extra_postargs, pp_opts):
@@ -172,7 +172,7 @@ class UnixCCompiler(CCompiler):
         try:
             self.spawn(compiler_so + cc_args + [src, '-o', obj] +
                        extra_postargs)
-        except DistutilsExecError, msg:
+        except DistutilsExecError as msg:
             raise CompileError, msg
 
     def create_static_lib(self, objects, output_libname,
@@ -196,7 +196,7 @@ class UnixCCompiler(CCompiler):
             if self.ranlib:
                 try:
                     self.spawn(self.ranlib + [output_filename])
-                except DistutilsExecError, msg:
+                except DistutilsExecError as msg:
                     raise LibError, msg
         else:
             log.debug("skipping %s (up-to-date)", output_filename)
@@ -250,7 +250,7 @@ class UnixCCompiler(CCompiler):
                     linker = _darwin_compiler_fixup(linker, ld_args)
 
                 self.spawn(linker + ld_args)
-            except DistutilsExecError, msg:
+            except DistutilsExecError as msg:
                 raise LinkError, msg
         else:
             log.debug("skipping %s (up-to-date)", output_filename)

util.py

@@ -229,7 +229,7 @@ def subst_vars (s, local_vars):
 
     try:
         return re.sub(r'\$([a-zA-Z_][a-zA-Z_0-9]*)', _subst, s)
-    except KeyError, var:
+    except KeyError as var:
         raise ValueError, "invalid variable '$%s'" % var
 
 # subst_vars ()