Get the value of selected row of a datagrid with ironpython

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I'm using VS 2013 with PTVS and I want to get the values of the selected line in my datagrid. But I'm beginner for python and WPF so I'm getting some trouble, so my datagrid:

<DataGrid CurrentCellChanged="infoVendas" IsReadOnly="True" x:Name="datagridvendas" Opacity="0" AutoGenerateColumns="False" Height="auto" Width="auto" IsSynchronizedWithCurrentItem="True" ItemsSource="{Binding Source={StaticResource XML_Vendas},XPath=Vendas/*,Mode=TwoWay}">
            <DataGrid.Style>
                <Style TargetType="DataGrid">
                    <Style.Triggers>
                        <DataTrigger Binding="{Binding ElementName=checkstackVenda, Path=IsChecked}" Value="True">
                            <DataTrigger.EnterActions>
                                <BeginStoryboard>
                                    <Storyboard>
                                        <DoubleAnimation  Duration="0:0:0.300" From="0" To="1" Storyboard.TargetProperty="Opacity" />
                                    </Storyboard>
                                </BeginStoryboard>
                            </DataTrigger.EnterActions>
                            <DataTrigger.ExitActions>
                                <BeginStoryboard>
                                    <Storyboard>
                                        <DoubleAnimation  Duration="0:0:0.300" From="1" To="0" Storyboard.TargetProperty="Opacity" />
                                    </Storyboard>
                                </BeginStoryboard>
                            </DataTrigger.ExitActions>
                        </DataTrigger>
                    </Style.Triggers>
                </Style>
            </DataGrid.Style>
            <DataGrid.Columns>
                <DataGridTextColumn Header="Data" Binding="{Binding XPath=@Compra_Data}"/>
                <DataGridTextColumn Header="Produto" Binding="{Binding XPath=@Prod_Desc}"/>
                <DataGridTextColumn Header="Status" Binding="{Binding XPath=@Status}"/>
                <DataGridTextColumn Header="Rastreio" Binding="{Binding XPath=@Rast_Id}"/>
                <DataGridTextColumn Header="Entrega" Binding="{Binding XPath=@Met_Entrega}"/>
                <DataGridTextColumn Header="Nick" Binding="{Binding XPath=@Buyer_Nick}"/>
                <DataGridTextColumn Header="Nome" Binding="{Binding XPath=@Buyer_Name}"/>
                <DataGridTextColumn Header="CPF" Binding="{Binding XPath=@Buyer_Cpf}"/>
                <DataGridTextColumn Header="Email" Binding="{Binding XPath=@Buyer_Email}"/>
                <DataGridTextColumn Header="Avaliacao Recebida" Binding="{Binding XPath=@Buyer_Feed}"/>
                <DataGridTextColumn Header="Avaliacao Enviada" Binding="{Binding XPath=@Seller_Feed}"/>
                <DataGridTextColumn Header="Lucro" Binding="{Binding XPath=@Profit}"/>
                <DataGridTextColumn Header="Total" Binding="{Binding XPath=@Total}"/>
            </DataGrid.Columns>
      </DataGrid>

and here is my try to get at least one value:

class MyWindow(Window):
def __init__(self):
    wpf.LoadComponent(self, 'Metal_Goat_Manager.xaml')

def infoVendas(self, sender, e):
    self.textConsole.Text = sender.SelectedValue

But nothing happen, the textblock shows nothing. I've tried selectedrows and selecteditems but i get an object and not a string with values. Maybe there is some way to 'read' this objects that I don't know?