Replaced `and...or...` constructs with PEP 308 conditional expressions.

django/contrib/admin/filters.py

@@ -216,7 +216,7 @@ class RelatedFieldListFilter(FieldListFilter):
             }
 
 FieldListFilter.register(lambda f: (
-        hasattr(f, 'rel') and bool(f.rel) or
+        bool(f.rel) if hasattr(f, 'rel') else
         isinstance(f, models.related.RelatedObject)), RelatedFieldListFilter)
 
 

django/contrib/admin/helpers.py

@@ -131,7 +131,7 @@ class AdminField(object):
             classes.append('required')
         if not self.is_first:
             classes.append('inline')
-        attrs = classes and {'class': ' '.join(classes)} or {}
+        attrs = {'class': ' '.join(classes)} if classes else {}
         return self.field.label_tag(contents=mark_safe(contents), attrs=attrs)
 
     def errors(self):
@@ -144,7 +144,7 @@ class AdminReadonlyField(object):
         # {{ field.name }} must be a useful class name to identify the field.
         # For convenience, store other field-related data here too.
         if callable(field):
-            class_name = field.__name__ != '<lambda>' and field.__name__ or ''
+            class_name = field.__name__ if field.__name__ != '<lambda>' else ''
         else:
             class_name = field
         self.field = {

django/contrib/admin/templatetags/log.py

@@ -53,4 +53,4 @@ def get_admin_log(parser, token):
         if tokens[4] != 'for_user':
             raise template.TemplateSyntaxError(
                 "Fourth argument to 'get_admin_log' must be 'for_user'")
-    return AdminLogNode(limit=tokens[1], varname=tokens[3], user=(len(tokens) > 5 and tokens[5] or None))
+    return AdminLogNode(limit=tokens[1], varname=tokens[3], user=(tokens[5] if len(tokens) > 5 else None))

django/contrib/admindocs/views.py

@@ -39,7 +39,7 @@ def bookmarklets(request):
     admin_root = urlresolvers.reverse('admin:index')
     return render_to_response('admin_doc/bookmarklets.html', {
         'root_path': admin_root,
-        'admin_url': "%s://%s%s" % (request.is_secure() and 'https' or 'http', request.get_host(), admin_root),
+        'admin_url': "%s://%s%s" % ('https' if request.is_secure() else 'http', request.get_host(), admin_root),
     }, context_instance=RequestContext(request))
 
 @staff_member_required
@@ -287,7 +287,7 @@ def template_detail(request, template):
             templates.append({
                 'file': template_file,
                 'exists': os.path.exists(template_file),
-                'contents': lambda: os.path.exists(template_file) and open(template_file).read() or '',
+                'contents': lambda: open(template_file).read() if os.path.exists(template_file) else '',
                 'site_id': settings_mod.SITE_ID,
                 'site': site_obj,
                 'order': list(settings_mod.TEMPLATE_DIRS).index(dir),

django/contrib/auth/forms.py

@@ -237,7 +237,7 @@ class PasswordResetForm(forms.Form):
                 'uid': int_to_base36(user.pk),
                 'user': user,
                 'token': token_generator.make_token(user),
-                'protocol': use_https and 'https' or 'http',
+                'protocol': 'https' if use_https else 'http',
             }
             subject = loader.render_to_string(subject_template_name, c)
             # Email subject *must not* contain newlines

django/contrib/gis/geos/geometry.py

@@ -384,7 +384,7 @@ class GEOSGeometry(GEOSBase, ListMixin):
     @property
     def wkt(self):
         "Returns the WKT (Well-Known Text) representation of this Geometry."
-        return wkt_w(self.hasz and 3 or 2).write(self).decode()
+        return wkt_w(3 if self.hasz else 2).write(self).decode()
 
     @property
     def hex(self):
@@ -395,7 +395,7 @@ class GEOSGeometry(GEOSBase, ListMixin):
         """
         # A possible faster, all-python, implementation:
         #  str(self.wkb).encode('hex')
-        return wkb_w(self.hasz and 3 or 2).write_hex(self)
+        return wkb_w(3 if self.hasz else 2).write_hex(self)
 
     @property
     def hexewkb(self):
@@ -407,7 +407,7 @@ class GEOSGeometry(GEOSBase, ListMixin):
         if self.hasz and not GEOS_PREPARE:
             # See: http://trac.osgeo.org/geos/ticket/216
             raise GEOSException('Upgrade GEOS to 3.1 to get valid 3D HEXEWKB.')
-        return ewkb_w(self.hasz and 3 or 2).write_hex(self)
+        return ewkb_w(3 if self.hasz else 2).write_hex(self)
 
     @property
     def json(self):
@@ -427,7 +427,7 @@ class GEOSGeometry(GEOSBase, ListMixin):
         as a Python buffer.  SRID and Z values are not included, use the
         `ewkb` property instead.
         """
-        return wkb_w(self.hasz and 3 or 2).write(self)
+        return wkb_w(3 if self.hasz else 2).write(self)
 
     @property
     def ewkb(self):
@@ -439,7 +439,7 @@ class GEOSGeometry(GEOSBase, ListMixin):
         if self.hasz and not GEOS_PREPARE:
             # See: http://trac.osgeo.org/geos/ticket/216
             raise GEOSException('Upgrade GEOS to 3.1 to get valid 3D EWKB.')
-        return ewkb_w(self.hasz and 3 or 2).write(self)
+        return ewkb_w(3 if self.hasz else 2).write(self)
 
     @property
     def kml(self):

django/contrib/gis/utils/layermapping.py

@@ -546,7 +546,7 @@ class LayerMapping(object):
                         # Attempting to save.
                         m.save(using=self.using)
                         num_saved += 1
-                        if verbose: stream.write('%s: %s\n' % (is_update and 'Updated' or 'Saved', m))
+                        if verbose: stream.write('%s: %s\n' % ('Updated' if is_update else 'Saved', m))
                     except SystemExit:
                         raise
                     except Exception as msg:

django/contrib/sitemaps/__init__.py

@@ -94,7 +94,7 @@ class Sitemap(object):
                 'location':   loc,
                 'lastmod':    self.__get('lastmod', item, None),
                 'changefreq': self.__get('changefreq', item, None),
-                'priority':   str(priority is not None and priority or ''),
+                'priority':   str(priority if priority is not None else ''),
             }
             urls.append(url_info)
         return urls

django/contrib/staticfiles/finders.py

@@ -245,7 +245,7 @@ def find(path, all=False):
     if matches:
         return matches
     # No match.
-    return all and [] or None
+    return [] if all else None
 
 
 def get_finders():

django/contrib/staticfiles/management/commands/collectstatic.py

@@ -175,11 +175,9 @@ Type 'yes' to continue, or 'no' to cancel: """
             summary = template % {
                 'modified_count': modified_count,
                 'identifier': 'static file' + ('' if modified_count == 1 else 's'),
-                'action': self.symlink and 'symlinked' or 'copied',
-                'destination': (destination_path and " to '%s'"
-                                % destination_path or ''),
-                'unmodified': (collected['unmodified'] and ', %s unmodified'
-                               % unmodified_count or ''),
+                'action': 'symlinked' if self.symlink else 'copied',
+                'destination': (" to '%s'" % destination_path if destination_path else ''),
+                'unmodified': (', %s unmodified' % unmodified_count if collected['unmodified'] else ''),
                 'post_processed': (collected['post_processed'] and
                                    ', %s post-processed'
                                    % post_processed_count or ''),

django/core/files/locks.py

@@ -41,7 +41,7 @@ except (ImportError, AttributeError):
 
 def fd(f):
     """Get a filedescriptor from something which could be a file or an fd."""
-    return hasattr(f, 'fileno') and f.fileno() or f
+    return f.fileno() if hasattr(f, 'fileno') else f
 
 if system_type == 'nt':
     def lock(file, flags):

django/core/files/move.py

@@ -62,7 +62,7 @@ def file_move_safe(old_file_name, new_file_name, chunk_size = 1024*64, allow_ove
     with open(old_file_name, 'rb') as old_file:
         # now open the new file, not forgetting allow_overwrite
         fd = os.open(new_file_name, os.O_WRONLY | os.O_CREAT | getattr(os, 'O_BINARY', 0) |
-                                    (not allow_overwrite and os.O_EXCL or 0))
+                                    (os.O_EXCL if not allow_overwrite else 0))
         try:
             locks.lock(fd, locks.LOCK_EX)
             current_chunk = None
@@ -77,8 +77,8 @@ def file_move_safe(old_file_name, new_file_name, chunk_size = 1024*64, allow_ove
     try:
         os.remove(old_file_name)
     except OSError as e:
-        # Certain operating systems (Cygwin and Windows) 
-        # fail when deleting opened files, ignore it.  (For the 
+        # Certain operating systems (Cygwin and Windows)
+        # fail when deleting opened files, ignore it.  (For the
         # systems where this happens, temporary files will be auto-deleted
         # on close anyway.)
         if getattr(e, 'winerror', 0) != 32 and getattr(e, 'errno', 0) != 13:

django/core/management/commands/createcachetable.py

@@ -38,7 +38,7 @@ class Command(LabelCommand):
         qn = connection.ops.quote_name
         for f in fields:
             field_output = [qn(f.name), f.db_type(connection=connection)]
-            field_output.append("%sNULL" % (not f.null and "NOT " or ""))
+            field_output.append("%sNULL" % ("NOT " if not f.null else ""))
             if f.primary_key:
                 field_output.append("PRIMARY KEY")
             elif f.unique:
@@ -51,7 +51,7 @@ class Command(LabelCommand):
             table_output.append(" ".join(field_output))
         full_statement = ["CREATE TABLE %s (" % qn(tablename)]
         for i, line in enumerate(table_output):
-            full_statement.append('    %s%s' % (line, i < len(table_output)-1 and ',' or ''))
+            full_statement.append('    %s%s' % (line, ',' if i < len(table_output)-1 else ''))
         full_statement.append(');')
         with transaction.commit_on_success_unless_managed():
             curs = connection.cursor()

django/core/management/commands/runserver.py

@@ -99,7 +99,7 @@ class Command(BaseCommand):
             "started_at": datetime.now().strftime('%B %d, %Y - %X'),
             "version": self.get_version(),
             "settings": settings.SETTINGS_MODULE,
-            "addr": self._raw_ipv6 and '[%s]' % self.addr or self.addr,
+            "addr": '[%s]' % self.addr if self._raw_ipv6 else self.addr,
             "port": self.port,
             "quit_command": quit_command,
         })

django/db/backends/creation.py

@@ -97,7 +97,7 @@ class BaseDatabaseCreation(object):
                           style.SQL_TABLE(qn(opts.db_table)) + ' (']
         for i, line in enumerate(table_output):  # Combine and add commas.
             full_statement.append(
-                '    %s%s' % (line, i < len(table_output) - 1 and ',' or ''))
+                '    %s%s' % (line, ',' if i < len(table_output) - 1 else ''))
         full_statement.append(')')
         if opts.db_tablespace:
             tablespace_sql = self.connection.ops.tablespace_sql(

django/db/backends/util.py

@@ -83,7 +83,7 @@ class CursorDebugWrapper(CursorWrapper):
 ###############################################
 
 def typecast_date(s):
-    return s and datetime.date(*map(int, s.split('-'))) or None # returns None if s is null
+    return datetime.date(*map(int, s.split('-'))) if s else None # returns None if s is null
 
 def typecast_time(s): # does NOT store time zone information
     if not s: return None

django/db/models/query.py

@@ -125,7 +125,7 @@ class QuerySet(object):
             else:
                 stop = None
             qs.query.set_limits(start, stop)
-            return k.step and list(qs)[::k.step] or qs
+            return list(qs)[::k.step] if k.step else qs
 
         qs = self._clone()
         qs.query.set_limits(k, k + 1)

django/db/models/sql/aggregates.py

@@ -99,7 +99,7 @@ class Count(Aggregate):
     sql_template = '%(function)s(%(distinct)s%(field)s)'
 
     def __init__(self, col, distinct=False, **extra):
-        super(Count, self).__init__(col, distinct=distinct and 'DISTINCT ' or '', **extra)
+        super(Count, self).__init__(col, distinct='DISTINCT ' if distinct else '', **extra)
 
 class Max(Aggregate):
     sql_function = 'MAX'

django/forms/forms.py

@@ -134,7 +134,7 @@ class BaseForm(object):
 
         Subclasses may wish to override.
         """
-        return self.prefix and ('%s-%s' % (self.prefix, field_name)) or field_name
+        return '%s-%s' % (self.prefix, field_name) if self.prefix else field_name
 
     def add_initial_prefix(self, field_name):
         """

django/middleware/common.py

@@ -85,7 +85,7 @@ class CommonMiddleware(object):
             return
         if new_url[0]:
             newurl = "%s://%s%s" % (
-                request.is_secure() and 'https' or 'http',
+                'https' if request.is_secure() else 'http',
                 new_url[0], urlquote(new_url[1]))
         else:
             newurl = urlquote(new_url[1])

django/middleware/locale.py

@@ -49,7 +49,7 @@ class LocaleMiddleware(object):
 
             if path_valid:
                 language_url = "%s://%s/%s%s" % (
-                    request.is_secure() and 'https' or 'http',
+                    'https' if request.is_secure() else 'http',
                     request.get_host(), language, request.get_full_path())
                 return HttpResponseRedirect(language_url)
 

django/utils/log.py

@@ -92,8 +92,8 @@ class AdminEmailHandler(logging.Handler):
             request = record.request
             subject = '%s (%s IP): %s' % (
                 record.levelname,
-                (request.META.get('REMOTE_ADDR') in settings.INTERNAL_IPS
-                 and 'internal' or 'EXTERNAL'),
+                ('internal' if request.META.get('REMOTE_ADDR') in settings.INTERNAL_IPS
+                 else 'EXTERNAL'),
                 record.getMessage()
             )
             filter = get_exception_reporter_filter(request)

django/views/debug.py

@@ -405,7 +405,7 @@ class ExceptionReporter(object):
             if pre_context_lineno is not None:
                 frames.append({
                     'tb': tb,
-                    'type': module_name.startswith('django.') and 'django' or 'user',
+                    'type': 'django' if module_name.startswith('django.') else 'user',
                     'filename': filename,
                     'function': function,
                     'lineno': lineno + 1,

docs/_ext/djangodocs.py

@@ -137,7 +137,7 @@ class DjangoHTMLTranslator(SmartyPantsHTMLTranslator):
         )
         title = "%s%s" % (
             self.version_text[node['type']] % node['version'],
-            len(node) and ":" or "."
+            ":" if len(node) else "."
         )
         self.body.append('<span class="title">%s</span> ' % title)
 

tests/forms_tests/tests/test_forms.py

@@ -1398,7 +1398,7 @@ class FormsTestCase(TestCase):
             birthday = DateField()
 
             def add_prefix(self, field_name):
-                return self.prefix and '%s-prefix-%s' % (self.prefix, field_name) or field_name
+                return '%s-prefix-%s' % (self.prefix, field_name) if self.prefix else field_name
 
         p = Person(prefix='foo')
         self.assertHTMLEqual(p.as_ul(), """<li><label for="id_foo-prefix-first_name">First name:</label> <input type="text" name="foo-prefix-first_name" id="id_foo-prefix-first_name" /></li>