[Qemu-devel] [PATCH v4 01/13] qapi: use items()/values() intead of iteritems()/itervalues()

["Daniel P. Berrange" <berrange@redhat.com>]

The iteritems()/itervalues() methods are gone in py3, but the
items()/values() methods are still around. The latter are less
efficient than the former in py2, but this has unmeasurably
small impact on QEMU build time, so taking portability over
efficiency is a net win.

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
---
 scripts/qapi.py                | 24 +++++++++++------------
 scripts/qapi2texi.py           | 11 ++++++-----
 tests/qapi-schema/test-qapi.py | 43 +++++++++++++++++++++---------------------
 3 files changed, 40 insertions(+), 38 deletions(-)

diff --git a/scripts/qapi.py b/scripts/qapi.py
index 43a54bf40f..98d7123d27 100644
--- a/scripts/qapi.py
+++ b/scripts/qapi.py
@@ -11,6 +11,7 @@
 # This work is licensed under the terms of the GNU GPL, version 2.
 # See the COPYING file in the top-level directory.
 
+from __future__ import print_function
 import errno
 import getopt
 import os
@@ -244,7 +245,7 @@ class QAPIDoc(object):
                                "'Returns:' is only valid for commands")
 
     def check(self):
-        bogus = [name for name, section in self.args.iteritems()
+        bogus = [name for name, section in self.args.items()
                  if not section.member]
         if bogus:
             raise QAPISemError(
@@ -299,7 +300,7 @@ class QAPISchemaParser(object):
                 if not isinstance(pragma, dict):
                     raise QAPISemError(
                         info, "Value of 'pragma' must be a dictionary")
-                for name, value in pragma.iteritems():
+                for name, value in pragma.items():
                     self._pragma(name, value, info)
             else:
                 expr_elem = {'expr': expr,
@@ -1467,7 +1468,7 @@ class QAPISchema(object):
             self._def_exprs()
             self.check()
         except QAPIError as err:
-            print >>sys.stderr, err
+            print(err, file=sys.stderr)
             exit(1)
 
     def _def_entity(self, ent):
@@ -1565,7 +1566,7 @@ class QAPISchema(object):
 
     def _make_members(self, data, info):
         return [self._make_member(key, value, info)
-                for (key, value) in data.iteritems()]
+                for (key, value) in data.items()]
 
     def _def_struct_type(self, expr, info, doc):
         name = expr['struct']
@@ -1597,11 +1598,11 @@ class QAPISchema(object):
                 name, info, doc, 'base', self._make_members(base, info)))
         if tag_name:
             variants = [self._make_variant(key, value)
-                        for (key, value) in data.iteritems()]
+                        for (key, value) in data.items()]
             members = []
         else:
             variants = [self._make_simple_variant(key, value, info)
-                        for (key, value) in data.iteritems()]
+                        for (key, value) in data.items()]
             typ = self._make_implicit_enum_type(name, info,
                                                 [v.name for v in variants])
             tag_member = QAPISchemaObjectTypeMember('type', typ, False)
@@ -1616,7 +1617,7 @@ class QAPISchema(object):
         name = expr['alternate']
         data = expr['data']
         variants = [self._make_variant(key, value)
-                    for (key, value) in data.iteritems()]
+                    for (key, value) in data.items()]
         tag_member = QAPISchemaObjectTypeMember('type', 'QType', False)
         self._def_entity(
             QAPISchemaAlternateType(name, info, doc,
@@ -1931,7 +1932,7 @@ def parse_command_line(extra_options='', extra_long_options=[]):
                                        ['source', 'header', 'prefix=',
                                         'output-dir='] + extra_long_options)
     except getopt.GetoptError as err:
-        print >>sys.stderr, "%s: %s" % (sys.argv[0], str(err))
+        print("%s: %s" % (sys.argv[0], str(err)), file=sys.stderr)
         sys.exit(1)
 
     output_dir = ''
@@ -1945,9 +1946,8 @@ def parse_command_line(extra_options='', extra_long_options=[]):
         if o in ('-p', '--prefix'):
             match = re.match(r'([A-Za-z_.-][A-Za-z0-9_.-]*)?', a)
             if match.end() != len(a):
-                print >>sys.stderr, \
-                    "%s: 'funny character '%s' in argument of --prefix" \
-                    % (sys.argv[0], a[match.end()])
+                print("%s: 'funny character '%s' in argument of --prefix" \
+                      % (sys.argv[0], a[match.end()]), file=sys.stderr)
                 sys.exit(1)
             prefix = a
         elif o in ('-o', '--output-dir'):
@@ -1964,7 +1964,7 @@ def parse_command_line(extra_options='', extra_long_options=[]):
         do_h = True
 
     if len(args) != 1:
-        print >>sys.stderr, "%s: need exactly one argument" % sys.argv[0]
+        print("%s: need exactly one argument" % sys.argv[0], file=sys.stderr)
         sys.exit(1)
     fname = args[0]
 
diff --git a/scripts/qapi2texi.py b/scripts/qapi2texi.py
index 92e2af2cd6..bf1c57b2e2 100755
--- a/scripts/qapi2texi.py
+++ b/scripts/qapi2texi.py
@@ -4,6 +4,7 @@
 # This work is licensed under the terms of the GNU LGPL, version 2+.
 # See the COPYING file in the top-level directory.
 """This script produces the documentation of a qapi schema in texinfo format"""
+from __future__ import print_function
 import re
 import sys
 
@@ -145,7 +146,7 @@ def texi_member(member, suffix=''):
 def texi_members(doc, what, base, variants, member_func):
     """Format the table of members"""
     items = ''
-    for section in doc.args.itervalues():
+    for section in doc.args.values():
         # TODO Drop fallbacks when undocumented members are outlawed
         if section.text:
             desc = texi_format(section.text)
@@ -274,15 +275,15 @@ def texi_schema(schema):
 def main(argv):
     """Takes schema argument, prints result to stdout"""
     if len(argv) != 2:
-        print >>sys.stderr, "%s: need exactly 1 argument: SCHEMA" % argv[0]
+        print("%s: need exactly 1 argument: SCHEMA" % argv[0], file=sys.stderr)
         sys.exit(1)
 
     schema = qapi.QAPISchema(argv[1])
     if not qapi.doc_required:
-        print >>sys.stderr, ("%s: need pragma 'doc-required' "
-                             "to generate documentation" % argv[0])
+        print("%s: need pragma 'doc-required' "
+               "to generate documentation" % argv[0], file=sys.stderr)
         sys.exit(1)
-    print texi_schema(schema)
+    print(texi_schema(schema))
 
 
 if __name__ == '__main__':
diff --git a/tests/qapi-schema/test-qapi.py b/tests/qapi-schema/test-qapi.py
index fe0ca08d78..ac43d3458e 100644
--- a/tests/qapi-schema/test-qapi.py
+++ b/tests/qapi-schema/test-qapi.py
@@ -10,6 +10,7 @@
 # See the COPYING file in the top-level directory.
 #
 
+from __future__ import print_function
 from qapi import *
 from pprint import pprint
 import os
@@ -18,51 +19,51 @@ import sys
 
 class QAPISchemaTestVisitor(QAPISchemaVisitor):
     def visit_enum_type(self, name, info, values, prefix):
-        print 'enum %s %s' % (name, values)
+        print('enum %s %s' % (name, values))
         if prefix:
-            print '    prefix %s' % prefix
+            print('    prefix %s' % prefix)
 
     def visit_object_type(self, name, info, base, members, variants):
-        print 'object %s' % name
+        print('object %s' % name)
         if base:
-            print '    base %s' % base.name
+            print('    base %s' % base.name)
         for m in members:
-            print '    member %s: %s optional=%s' % \
-                (m.name, m.type.name, m.optional)
+            print('    member %s: %s optional=%s' % \
+                  (m.name, m.type.name, m.optional))
         self._print_variants(variants)
 
     def visit_alternate_type(self, name, info, variants):
-        print 'alternate %s' % name
+        print('alternate %s' % name)
         self._print_variants(variants)
 
     def visit_command(self, name, info, arg_type, ret_type,
                       gen, success_response, boxed):
-        print 'command %s %s -> %s' % \
-            (name, arg_type and arg_type.name, ret_type and ret_type.name)
-        print '   gen=%s success_response=%s boxed=%s' % \
-            (gen, success_response, boxed)
+        print('command %s %s -> %s' % \
+              (name, arg_type and arg_type.name, ret_type and ret_type.name))
+        print('   gen=%s success_response=%s boxed=%s' % \
+              (gen, success_response, boxed))
 
     def visit_event(self, name, info, arg_type, boxed):
-        print 'event %s %s' % (name, arg_type and arg_type.name)
-        print '   boxed=%s' % boxed
+        print('event %s %s' % (name, arg_type and arg_type.name))
+        print('   boxed=%s' % boxed)
 
     @staticmethod
     def _print_variants(variants):
         if variants:
-            print '    tag %s' % variants.tag_member.name
+            print('    tag %s' % variants.tag_member.name)
             for v in variants.variants:
-                print '    case %s: %s' % (v.name, v.type.name)
+                print('    case %s: %s' % (v.name, v.type.name))
 
 schema = QAPISchema(sys.argv[1])
 schema.visit(QAPISchemaTestVisitor())
 
 for doc in schema.docs:
     if doc.symbol:
-        print 'doc symbol=%s' % doc.symbol
+        print('doc symbol=%s' % doc.symbol)
     else:
-        print 'doc freeform'
-    print '    body=\n%s' % doc.body.text
-    for arg, section in doc.args.iteritems():
-        print '    arg=%s\n%s' % (arg, section.text)
+        print('doc freeform')
+    print('    body=\n%s' % doc.body.text)
+    for arg, section in doc.args.items():
+        print('    arg=%s\n%s' % (arg, section.text))
     for section in doc.sections:
-        print '    section=%s\n%s' % (section.name, section.text)
+        print('    section=%s\n%s' % (section.name, section.text))
-- 
2.14.3