parameters: (self, picking)
docstring: Ask the tracking link to the service provider
  
          :param picking: record of stock.picking
          :return str: an URL containing the tracking link or False
docstring_summary: Ask the tracking link to the service provider
docstring_tokens: Ask the tracking link to the service provider
function: def get_tracking_link(self, picking):
          ''' Ask the tracking link to the service provider
  
          :param picking: record of stock.picking
          :return str: an URL containing the tracking link or False
          '''
          self.ensure_one()
          if hasattr(self, '%s_get_tracking_link' % self.delivery_type):
              return getattr(self, '%s_get_tracking_link' % self.delivery_type)(picking)
function_tokens: def get_tracking_link ( self , picking ) : self . ensure_one ( ) if hasattr ( self , '%s_get_tracking_link' % self . delivery_type ) : return getattr ( self , '%s_get_tracking_link' % self . delivery_type ) ( picking )