Untiwe

Не пустая строка в python является True

<Window
    x:Class="Monitor.SomeWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:local="clr-namespace:Monitor"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    Title="SomeWindow"
    Width="800"
    Height="450"
    mc:Ignorable="d">
    <Window.Resources>
        <Style
            x:Key="BaseFontFamily"
            TargetType="TextBlock">
            <Setter Property="FontSize" Value="90" />
        </Style>
        <Style
            x:Key="Numbers1Style"
            BasedOn="{StaticResource BaseFontFamily}"
            TargetType="TextBlock">
            <Setter Property="Foreground" Value="LightCoral" />
        </Style>
        <Style
            x:Key="Numbers2Style"
            BasedOn="{StaticResource BaseFontFamily}"
            TargetType="TextBlock">
            <Setter Property="Foreground" Value="Bisque" />
        </Style>
    </Window.Resources>
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="*" />
            <RowDefinition Height="*" />
        </Grid.RowDefinitions>
        <TextBlock
            Grid.Row="0"
            HorizontalAlignment="Center"
            VerticalAlignment="Center"
            Style="{Binding TimeBlockStyle, RelativeSource={RelativeSource AncestorType=local:SomeWindow}}"
            Text="{Binding Path=RightTeam.TeamCounter, Mode=OneWay, UpdateSourceTrigger=PropertyChanged}" />
        <Button
            Grid.Row="1"
            Click="OnButtonClick" />
    </Grid>
</Window>

public partial class SomeWindow : Window
{
    public static readonly DependencyProperty TimeBlockStyleProperty = DependencyProperty.Register(
        nameof(TimeBlockStyle), typeof(Style), typeof(SomeWindow), new PropertyMetadata(default(Style)));

    public Style TimeBlockStyle
    {
        get { return (Style)GetValue(TimeBlockStyleProperty); }
        set { SetValue(TimeBlockStyleProperty, value); }
    }

    public SomeWindow()
    {
        InitializeComponent();
        TimeBlockStyle = (Style)Resources["Numbers1Style"];
    }

    private void OnButtonClick(object sender, RoutedEventArgs e)
    {
        TimeBlockStyle = (Style)Resources["Numbers2Style"];
    }
}

def get_queryset(self):
        if not self.request.GET:
            return Posts.objects.all()#если нет параметров, просто возвращаем все посты
        keyword = self.request.GET.get('key')#получаем ключевое слово
        filters = Q()#создаем первый объект Q, что бы складывать с ним другие
        for key in ['author', 'name', 'text']:
                value = self.request.GET.get(key)
                if value:
                        filters |= Q(**{f'{key}__icontains': keyword})
        return Posts.objects.filter(filters)

def a_change_password(request):
    u = User.objects.get(username=request.user)
    if request.method == 'POST':
        form = ChangePasswordForm(request.POST)
        if form.is_valid():
            old_password = request.POST.get("old_password")
            new_pass = request.POST.get("new_password")
            new_pass_rep = request.POST.get("new_password_repeat")
            if check_password(old_password,u.password):
                return HttpResponse('ok')
            else:
                return HttpResponse('bad')
    else:
            form = ChangePasswordForm()

    return render(request, 'login/change_password.html',
              {'form': form, 'user': u})