From 9c487b5974ee7e7f196079611d7352364e8873ed Mon Sep 17 00:00:00 2001
From: Aymeric Augustin <aymeric.augustin@m4x.org>
Date: Fri, 17 May 2013 16:33:36 +0200
Subject: [PATCH] Replaced an antiquated pattern.

Thanks Lennart Regebro for pointing it out.
---
 django/contrib/admin/options.py                        |  4 ++--
 django/contrib/comments/views/utils.py                 |  2 +-
 django/contrib/contenttypes/views.py                   |  2 +-
 django/contrib/formtools/tests/wizard/test_forms.py    |  2 +-
 django/contrib/gis/sitemaps/views.py                   |  2 +-
 django/contrib/gis/utils/layermapping.py               |  2 +-
 .../staticfiles/management/commands/collectstatic.py   |  2 +-
 django/core/management/__init__.py                     |  2 +-
 django/core/management/base.py                         |  4 ++--
 django/core/management/commands/createcachetable.py    |  2 +-
 django/core/management/commands/runserver.py           |  4 ++--
 django/db/models/base.py                               | 10 +++++-----
 django/db/models/fields/__init__.py                    |  4 ++--
 django/db/models/options.py                            |  2 +-
 django/db/models/related.py                            |  2 +-
 django/db/models/sql/aggregates.py                     |  4 ++--
 django/db/models/sql/compiler.py                       |  8 ++++----
 django/db/models/sql/query.py                          |  2 +-
 django/db/models/sql/subqueries.py                     |  2 +-
 django/forms/forms.py                                  |  2 +-
 django/forms/formsets.py                               |  2 +-
 django/forms/widgets.py                                |  2 +-
 django/http/multipartparser.py                         |  2 +-
 django/template/base.py                                |  2 +-
 django/template/defaulttags.py                         |  4 ++--
 django/utils/dateformat.py                             |  2 +-
 django/utils/html.py                                   |  5 ++++-
 django/utils/log.py                                    |  2 +-
 django/utils/translation/trans_real.py                 |  5 ++++-
 django/utils/tree.py                                   |  2 +-
 30 files changed, 49 insertions(+), 43 deletions(-)

diff --git a/django/contrib/admin/options.py b/django/contrib/admin/options.py
index 9bc3d55454c..7373837bb08 100644
--- a/django/contrib/admin/options.py
+++ b/django/contrib/admin/options.py
@@ -37,7 +37,7 @@ from django.utils.encoding import force_text
 
 HORIZONTAL, VERTICAL = 1, 2
 # returns the <ul> class for a given radio_admin field
-get_ul_class = lambda x: 'radiolist%s' % ((x == HORIZONTAL) and ' inline' or '')
+get_ul_class = lambda x: 'radiolist%s' % (' inline' if x == HORIZONTAL else '')
 
 
 class IncorrectLookupParameters(Exception):
@@ -189,7 +189,7 @@ class BaseModelAdmin(six.with_metaclass(RenameBaseModelAdminMethods)):
             kwargs['widget'] = widgets.AdminRadioSelect(attrs={
                 'class': get_ul_class(self.radio_fields[db_field.name]),
             })
-            kwargs['empty_label'] = db_field.blank and _('None') or None
+            kwargs['empty_label'] = _('None') if db_field.blank else None
 
         queryset = self.get_field_queryset(db, db_field, request)
         if queryset is not None:
diff --git a/django/contrib/comments/views/utils.py b/django/contrib/comments/views/utils.py
index 79f63762320..da70272282e 100644
--- a/django/contrib/comments/views/utils.py
+++ b/django/contrib/comments/views/utils.py
@@ -37,7 +37,7 @@ def next_redirect(request, fallback, **get_kwargs):
         else:
             anchor = ''
 
-        joiner = ('?' in next) and '&' or '?'
+        joiner = '&' if '?' in next else '?'
         next += joiner + urlencode(get_kwargs) + anchor
     return HttpResponseRedirect(next)
 
diff --git a/django/contrib/contenttypes/views.py b/django/contrib/contenttypes/views.py
index 5c22cb6672e..6d4a7192892 100644
--- a/django/contrib/contenttypes/views.py
+++ b/django/contrib/contenttypes/views.py
@@ -75,7 +75,7 @@ def shortcut(request, content_type_id, object_id):
     # If all that malarkey found an object domain, use it. Otherwise, fall back
     # to whatever get_absolute_url() returned.
     if object_domain is not None:
-        protocol = request.is_secure() and 'https' or 'http'
+        protocol = 'https' if request.is_secure() else 'http'
         return http.HttpResponseRedirect('%s://%s%s'
                                          % (protocol, object_domain, absurl))
     else:
diff --git a/django/contrib/formtools/tests/wizard/test_forms.py b/django/contrib/formtools/tests/wizard/test_forms.py
index 7425755cf58..21917822a70 100644
--- a/django/contrib/formtools/tests/wizard/test_forms.py
+++ b/django/contrib/formtools/tests/wizard/test_forms.py
@@ -17,7 +17,7 @@ from django.contrib.formtools.wizard.views import (WizardView,
 class DummyRequest(http.HttpRequest):
     def __init__(self, POST=None):
         super(DummyRequest, self).__init__()
-        self.method = POST and "POST" or "GET"
+        self.method = "POST" if POST else "GET"
         if POST is not None:
             self.POST.update(POST)
         self.session = {}
diff --git a/django/contrib/gis/sitemaps/views.py b/django/contrib/gis/sitemaps/views.py
index 36e48f7d209..9682c125d27 100644
--- a/django/contrib/gis/sitemaps/views.py
+++ b/django/contrib/gis/sitemaps/views.py
@@ -20,7 +20,7 @@ def index(request, sitemaps):
     """
     current_site = get_current_site(request)
     sites = []
-    protocol = request.is_secure() and 'https' or 'http'
+    protocol = 'https' if request.is_secure() else 'http'
     for section, site in sitemaps.items():
         if callable(site):
             pages = site().paginator.num_pages
diff --git a/django/contrib/gis/utils/layermapping.py b/django/contrib/gis/utils/layermapping.py
index 282dbc7450d..cb56b8bce21 100644
--- a/django/contrib/gis/utils/layermapping.py
+++ b/django/contrib/gis/utils/layermapping.py
@@ -201,7 +201,7 @@ class LayerMapping(object):
                 if not (ltype.name.startswith(gtype.name) or self.make_multi(ltype, model_field)):
                     raise LayerMapError('Invalid mapping geometry; model has %s%s, '
                                         'layer geometry type is %s.' %
-                                        (fld_name, (coord_dim == 3 and '(dim=3)') or '', ltype))
+                                        (fld_name, '(dim=3)' if coord_dim == 3 else '', ltype))
 
                 # Setting the `geom_field` attribute w/the name of the model field
                 # that is a Geometry.  Also setting the coordinate dimension
diff --git a/django/contrib/staticfiles/management/commands/collectstatic.py b/django/contrib/staticfiles/management/commands/collectstatic.py
index 22fdac7c767..c620993f331 100644
--- a/django/contrib/staticfiles/management/commands/collectstatic.py
+++ b/django/contrib/staticfiles/management/commands/collectstatic.py
@@ -174,7 +174,7 @@ Type 'yes' to continue, or 'no' to cancel: """
                         "%(destination)s%(unmodified)s%(post_processed)s.\n")
             summary = template % {
                 'modified_count': modified_count,
-                'identifier': 'static file' + (modified_count != 1 and 's' or ''),
+                '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 ''),
diff --git a/django/core/management/__init__.py b/django/core/management/__init__.py
index 7638937c94b..77d5e1b2642 100644
--- a/django/core/management/__init__.py
+++ b/django/core/management/__init__.py
@@ -63,7 +63,7 @@ def find_management_module(app_name):
 
     while parts:
         part = parts.pop()
-        f, path, descr = imp.find_module(part, path and [path] or None)
+        f, path, descr = imp.find_module(part, [path] if path else None)
         if f:
             f.close()
     return path
diff --git a/django/core/management/base.py b/django/core/management/base.py
index e6a968bbada..ba6ad8f4c03 100644
--- a/django/core/management/base.py
+++ b/django/core/management/base.py
@@ -60,7 +60,7 @@ class OutputWrapper(object):
         return getattr(self._out, name)
 
     def write(self, msg, style_func=None, ending=None):
-        ending = ending is None and self.ending or ending
+        ending = self.ending if ending is None else ending
         if ending and not msg.endswith(ending):
             msg += ending
         style_func = [f for f in (style_func, self.style_func, lambda x:x)
@@ -311,7 +311,7 @@ class BaseCommand(object):
             error_text = s.read()
             raise CommandError("One or more models did not validate:\n%s" % error_text)
         if display_num_errors:
-            self.stdout.write("%s error%s found" % (num_errors, num_errors != 1 and 's' or ''))
+            self.stdout.write("%s error%s found" % (num_errors, '' if num_errors == 1 else 's'))
 
     def handle(self, *args, **options):
         """
diff --git a/django/core/management/commands/createcachetable.py b/django/core/management/commands/createcachetable.py
index 94b6b09400a..4d1bc0403ee 100644
--- a/django/core/management/commands/createcachetable.py
+++ b/django/core/management/commands/createcachetable.py
@@ -44,7 +44,7 @@ class Command(LabelCommand):
             elif f.unique:
                 field_output.append("UNIQUE")
             if f.db_index:
-                unique = f.unique and "UNIQUE " or ""
+                unique = "UNIQUE " if f.unique else ""
                 index_output.append("CREATE %sINDEX %s ON %s (%s);" % \
                     (unique, qn('%s_%s' % (tablename, f.name)), qn(tablename),
                     qn(f.name)))
diff --git a/django/core/management/commands/runserver.py b/django/core/management/commands/runserver.py
index 0ca15fdb6ff..4fe03216d56 100644
--- a/django/core/management/commands/runserver.py
+++ b/django/core/management/commands/runserver.py
@@ -65,7 +65,7 @@ class Command(BaseCommand):
                 elif self.use_ipv6 and not _fqdn:
                     raise CommandError('"%s" is not a valid IPv6 address.' % self.addr)
         if not self.addr:
-            self.addr = self.use_ipv6 and '::1' or '127.0.0.1'
+            self.addr = '::1' if self.use_ipv6 else '127.0.0.1'
             self._raw_ipv6 = bool(self.use_ipv6)
         self.run(*args, **options)
 
@@ -86,7 +86,7 @@ class Command(BaseCommand):
 
         threading = options.get('use_threading')
         shutdown_message = options.get('shutdown_message', '')
-        quit_command = (sys.platform == 'win32') and 'CTRL-BREAK' or 'CONTROL-C'
+        quit_command = 'CTRL-BREAK' if sys.platform == 'win32' else 'CONTROL-C'
 
         self.stdout.write("Validating models...\n\n")
         self.validate(display_num_errors=True)
diff --git a/django/db/models/base.py b/django/db/models/base.py
index 1a8e32d49f5..feea26b6ccc 100644
--- a/django/db/models/base.py
+++ b/django/db/models/base.py
@@ -631,7 +631,7 @@ class Model(six.with_metaclass(ModelBase)):
         # If possible, try an UPDATE. If that doesn't update anything, do an INSERT.
         if pk_set and not force_insert:
             base_qs = cls._base_manager.using(using)
-            values = [(f, None, (raw and getattr(self, f.attname) or f.pre_save(self, False)))
+            values = [(f, None, (getattr(self, f.attname) if raw else f.pre_save(self, False)))
                       for f in non_pks]
             if not values:
                 # We can end up here when saving a model in inheritance chain where
@@ -698,8 +698,8 @@ class Model(six.with_metaclass(ModelBase)):
     def _get_next_or_previous_by_FIELD(self, field, is_next, **kwargs):
         if not self.pk:
             raise ValueError("get_next/get_previous cannot be used on unsaved objects.")
-        op = is_next and 'gt' or 'lt'
-        order = not is_next and '-' or ''
+        op = 'gt' if is_next else 'lt'
+        order = '' if is_next else '-'
         param = force_text(getattr(self, field.attname))
         q = Q(**{'%s__%s' % (field.name, op): param})
         q = q | Q(**{field.name: param, 'pk__%s' % op: self.pk})
@@ -712,8 +712,8 @@ class Model(six.with_metaclass(ModelBase)):
     def _get_next_or_previous_in_order(self, is_next):
         cachename = "__%s_order_cache" % is_next
         if not hasattr(self, cachename):
-            op = is_next and 'gt' or 'lt'
-            order = not is_next and '-_order' or '_order'
+            op = 'gt' if is_next else 'lt'
+            order = '_order' if is_next else '-_order'
             order_field = self._meta.order_with_respect_to
             obj = self._default_manager.filter(**{
                 order_field.name: getattr(self, order_field.attname)
diff --git a/django/db/models/fields/__init__.py b/django/db/models/fields/__init__.py
index a925f0c577e..13cec1bfba1 100644
--- a/django/db/models/fields/__init__.py
+++ b/django/db/models/fields/__init__.py
@@ -448,7 +448,7 @@ class Field(object):
     def get_choices(self, include_blank=True, blank_choice=BLANK_CHOICE_DASH):
         """Returns choices with a default blank choices included, for use
         as SelectField choices for this field."""
-        first_choice = include_blank and blank_choice or []
+        first_choice = blank_choice if include_blank else []
         if self.choices:
             return first_choice + list(self.choices)
         rel_model = self.rel.to
@@ -471,7 +471,7 @@ class Field(object):
         """
         Returns flattened choices with a default blank choice included.
         """
-        first_choice = include_blank and blank_choice or []
+        first_choice = blank_choice if include_blank else []
         return first_choice + list(self.flatchoices)
 
     def _get_val_from_obj(self, obj):
diff --git a/django/db/models/options.py b/django/db/models/options.py
index acb5ff38bcf..b8a79023e83 100644
--- a/django/db/models/options.py
+++ b/django/db/models/options.py
@@ -347,7 +347,7 @@ class Options(object):
         """
         Returns the requested field by name. Raises FieldDoesNotExist on error.
         """
-        to_search = many_to_many and (self.fields + self.many_to_many) or self.fields
+        to_search = (self.fields + self.many_to_many) if many_to_many else self.fields
         for f in to_search:
             if f.name == name:
                 return f
diff --git a/django/db/models/related.py b/django/db/models/related.py
index 6c93076c481..4b00dd343b2 100644
--- a/django/db/models/related.py
+++ b/django/db/models/related.py
@@ -27,7 +27,7 @@ class RelatedObject(object):
         Analogue of django.db.models.fields.Field.get_choices, provided
         initially for utilisation by RelatedFieldListFilter.
         """
-        first_choice = include_blank and blank_choice or []
+        first_choice = blank_choice if include_blank else []
         queryset = self.model._default_manager.all()
         if limit_to_currently_related:
             queryset = queryset.complex_filter(
diff --git a/django/db/models/sql/aggregates.py b/django/db/models/sql/aggregates.py
index 1b65847b7f1..23b79923d13 100644
--- a/django/db/models/sql/aggregates.py
+++ b/django/db/models/sql/aggregates.py
@@ -112,7 +112,7 @@ class StdDev(Aggregate):
 
     def __init__(self, col, sample=False, **extra):
         super(StdDev, self).__init__(col, **extra)
-        self.sql_function = sample and 'STDDEV_SAMP' or 'STDDEV_POP'
+        self.sql_function = 'STDDEV_SAMP' if sample else 'STDDEV_POP'
 
 class Sum(Aggregate):
     sql_function = 'SUM'
@@ -122,4 +122,4 @@ class Variance(Aggregate):
 
     def __init__(self, col, sample=False, **extra):
         super(Variance, self).__init__(col, **extra)
-        self.sql_function = sample and 'VAR_SAMP' or 'VAR_POP'
+        self.sql_function = 'VAR_SAMP' if sample else 'VAR_POP'
diff --git a/django/db/models/sql/compiler.py b/django/db/models/sql/compiler.py
index 7b7c4304205..bbe310c8c32 100644
--- a/django/db/models/sql/compiler.py
+++ b/django/db/models/sql/compiler.py
@@ -512,7 +512,7 @@ class SQLCompiler(object):
                 # Extra tables can end up in self.tables, but not in the
                 # alias_map if they aren't in a join. That's OK. We skip them.
                 continue
-            alias_str = (alias != name and ' %s' % alias or '')
+            alias_str = '' if alias == name else (' %s' % alias)
             if join_type and not first:
                 extra_cond = join_field.get_extra_restriction(
                     self.query.where_class, alias, lhs)
@@ -532,7 +532,7 @@ class SQLCompiler(object):
                     (qn(lhs), qn2(lhs_col), qn(alias), qn2(rhs_col)))
                 result.append('%s)' % extra_sql)
             else:
-                connector = not first and ', ' or ''
+                connector = '' if first else ', '
                 result.append('%s%s%s' % (connector, qn(name), alias_str))
             first = False
         for t in self.query.extra_tables:
@@ -541,7 +541,7 @@ class SQLCompiler(object):
             # calls increments the refcount, so an alias refcount of one means
             # this is the only reference.
             if alias not in self.query.alias_map or self.query.alias_refcount[alias] == 1:
-                connector = not first and ', ' or ''
+                connector = '' if first else ', '
                 result.append('%s%s' % (connector, qn(alias)))
                 first = False
         return result, from_params
@@ -959,7 +959,7 @@ class SQLUpdateCompiler(SQLCompiler):
         related queries are not available.
         """
         cursor = super(SQLUpdateCompiler, self).execute_sql(result_type)
-        rows = cursor and cursor.rowcount or 0
+        rows = cursor.rowcount if cursor else 0
         is_empty = cursor is None
         del cursor
         for query in self.query.get_related_updates():
diff --git a/django/db/models/sql/query.py b/django/db/models/sql/query.py
index 6db2bf6e123..0a4152587d3 100644
--- a/django/db/models/sql/query.py
+++ b/django/db/models/sql/query.py
@@ -532,7 +532,7 @@ class Query(object):
 
         # Ordering uses the 'rhs' ordering, unless it has none, in which case
         # the current ordering is used.
-        self.order_by = rhs.order_by and rhs.order_by[:] or self.order_by
+        self.order_by = rhs.order_by[:] if rhs.order_by else self.order_by
         self.extra_order_by = rhs.extra_order_by or self.extra_order_by
 
     def deferred_to_data(self, target, callback):
diff --git a/django/db/models/sql/subqueries.py b/django/db/models/sql/subqueries.py
index fae42b4be2a..20770162c92 100644
--- a/django/db/models/sql/subqueries.py
+++ b/django/db/models/sql/subqueries.py
@@ -245,7 +245,7 @@ class DateQuery(Query):
         self.clear_select_clause()
         self.select = [SelectInfo(select, None)]
         self.distinct = True
-        self.order_by = order == 'ASC' and [1] or [-1]
+        self.order_by = [1] if order == 'ASC' else [-1]
 
         if field.null:
             self.add_filter(("%s__isnull" % field_name, False))
diff --git a/django/forms/forms.py b/django/forms/forms.py
index f3a0fe6b386..b231de421ad 100644
--- a/django/forms/forms.py
+++ b/django/forms/forms.py
@@ -523,7 +523,7 @@ class BoundField(object):
         widget = self.field.widget
         id_ = widget.attrs.get('id') or self.auto_id
         if id_:
-            attrs = attrs and flatatt(attrs) or ''
+            attrs = flatatt(attrs) if attrs else ''
             contents = format_html('<label for="{0}"{1}>{2}</label>',
                                    widget.id_for_label(id_), attrs, contents
                                    )
diff --git a/django/forms/formsets.py b/django/forms/formsets.py
index 2bd11d9f534..d421770093c 100644
--- a/django/forms/formsets.py
+++ b/django/forms/formsets.py
@@ -119,7 +119,7 @@ class BaseFormSet(object):
             return self.management_form.cleaned_data[INITIAL_FORM_COUNT]
         else:
             # Use the length of the initial data if it's there, 0 otherwise.
-            initial_forms = self.initial and len(self.initial) or 0
+            initial_forms = len(self.initial) if self.initial else 0
         return initial_forms
 
     def _construct_forms(self):
diff --git a/django/forms/widgets.py b/django/forms/widgets.py
index e72ab014b82..aca4a457af5 100644
--- a/django/forms/widgets.py
+++ b/django/forms/widgets.py
@@ -775,7 +775,7 @@ class MultiWidget(Widget):
     You'll probably want to use this class with MultiValueField.
     """
     def __init__(self, widgets, attrs=None):
-        self.widgets = [isinstance(w, type) and w() or w for w in widgets]
+        self.widgets = [w() if isinstance(w, type) else w for w in widgets]
         super(MultiWidget, self).__init__(attrs)
 
     def render(self, name, value, attrs=None):
diff --git a/django/http/multipartparser.py b/django/http/multipartparser.py
index 0c07335f27d..0e999f2dedb 100644
--- a/django/http/multipartparser.py
+++ b/django/http/multipartparser.py
@@ -292,7 +292,7 @@ class LazyStream(six.Iterator):
 
     def read(self, size=None):
         def parts():
-            remaining = (size is not None and [size] or [self._remaining])[0]
+            remaining = self._remaining if size is None else size
             # do the whole thing in one shot if no limit was provided.
             if remaining is None:
                 yield b''.join(self)
diff --git a/django/template/base.py b/django/template/base.py
index c5bddaf63e0..dc6b0c366c7 100644
--- a/django/template/base.py
+++ b/django/template/base.py
@@ -641,7 +641,7 @@ class FilterExpression(object):
                                       (name, len(nondefs), plen))
 
         # Defaults can be overridden.
-        defaults = defaults and list(defaults) or []
+        defaults = list(defaults) if defaults else []
         try:
             for parg in provided:
                 defaults.pop(0)
diff --git a/django/template/defaulttags.py b/django/template/defaulttags.py
index b272322e1b8..04e7a37d8e8 100644
--- a/django/template/defaulttags.py
+++ b/django/template/defaulttags.py
@@ -127,7 +127,7 @@ class ForNode(Node):
             self.nodelist_empty = nodelist_empty
 
     def __repr__(self):
-        reversed_text = self.is_reversed and ' reversed' or ''
+        reversed_text = ' reversed' if self.is_reversed else ''
         return "<For Node: for %s in %s, tail_len: %d%s>" % \
             (', '.join(self.loopvars), self.sequence, len(self.nodelist_loop),
              reversed_text)
@@ -788,7 +788,7 @@ def do_for(parser, token):
                                   " words: %s" % token.contents)
 
     is_reversed = bits[-1] == 'reversed'
-    in_index = is_reversed and -3 or -2
+    in_index = -3 if is_reversed else -2
     if bits[in_index] != 'in':
         raise TemplateSyntaxError("'for' statements should use the format"
                                   " 'for x in y': %s" % token.contents)
diff --git a/django/utils/dateformat.py b/django/utils/dateformat.py
index b2586ba1ff0..6d0a7b63f72 100644
--- a/django/utils/dateformat.py
+++ b/django/utils/dateformat.py
@@ -234,7 +234,7 @@ class DateFormat(TimeFormat):
 
     def T(self):
         "Time zone of this machine; e.g. 'EST' or 'MDT'"
-        name = self.timezone and self.timezone.tzname(self.data) or None
+        name = self.timezone.tzname(self.data) if self.timezone else None
         if name is None:
             name = self.format('O')
         return six.text_type(name)
diff --git a/django/utils/html.py b/django/utils/html.py
index 650e8485ab1..8b28d97d132 100644
--- a/django/utils/html.py
+++ b/django/utils/html.py
@@ -187,7 +187,10 @@ def urlize(text, trim_url_limit=None, nofollow=False, autoescape=False):
 
     If autoescape is True, the link text and URLs will get autoescaped.
     """
-    trim_url = lambda x, limit=trim_url_limit: limit is not None and (len(x) > limit and ('%s...' % x[:max(0, limit - 3)])) or x
+    def trim_url(x, limit=trim_url_limit):
+        if limit is None or len(x) <= limit:
+            return x
+        return '%s...' % x[:max(0, limit - 3)]
     safe_input = isinstance(text, SafeData)
     words = word_split_re.split(force_text(text))
     for i, word in enumerate(words):
diff --git a/django/utils/log.py b/django/utils/log.py
index b291b867062..a9b62caae12 100644
--- a/django/utils/log.py
+++ b/django/utils/log.py
@@ -111,7 +111,7 @@ class AdminEmailHandler(logging.Handler):
 
         message = "%s\n\n%s" % (stack_trace, request_repr)
         reporter = ExceptionReporter(request, is_email=True, *exc_info)
-        html_message = self.include_html and reporter.get_traceback_html() or None
+        html_message = reporter.get_traceback_html() if self.include_html else None
         mail.mail_admins(subject, message, fail_silently=True,
                          html_message=html_message,
                          connection=self.connection())
diff --git a/django/utils/translation/trans_real.py b/django/utils/translation/trans_real.py
index ad172407de1..07353c35eea 100644
--- a/django/utils/translation/trans_real.py
+++ b/django/utils/translation/trans_real.py
@@ -651,7 +651,10 @@ def parse_accept_lang_header(lang_string):
         first, lang, priority = pieces[i : i + 3]
         if first:
             return []
-        priority = priority and float(priority) or 1.0
+        if priority:
+            priority = float(priority)
+        if not priority:        # if priority is 0.0 at this point make it 1.0
+             priority = 1.0
         result.append((lang, priority))
     result.sort(key=lambda k: k[1], reverse=True)
     return result
diff --git a/django/utils/tree.py b/django/utils/tree.py
index 4152b4600b5..3f93738b4fe 100644
--- a/django/utils/tree.py
+++ b/django/utils/tree.py
@@ -20,7 +20,7 @@ class Node(object):
         Constructs a new Node. If no connector is given, the default will be
         used.
         """
-        self.children = children and children[:] or []
+        self.children = children[:] if children else []
         self.connector = connector or self.default
         self.negated = negated