human
Solve the following python programming problem given the following code:
def Dump(activity) : 
    xroot = etree.Element ('pwx', nsmap = PWXIO.Namespaces) 
    xroot.attrib ['creator'] = 'tapiriik' 
    xroot.attrib ['version'] = '1.0' 
    xworkout = etree.SubElement (xroot, 'workout') 
    if (activity.Type in PWXIO._reverseSportTypeMappings) : 
        etree.SubElement (xworkout, 'sportType').text = PWXIO._reverseSportTypeMappings [activity.Type] 
if activity.Name : 
        etree.SubElement (xworkout, 'title').text = activity.Name 
if activity.Notes : 
        etree.SubElement (xworkout, 'cmt').text = activity.Notes 
xdevice = etree.SubElement (xworkout, 'device') 
    etree.SubElement (xdevice, 'make').text = 'tapiriik' 
    if hasattr (activity, 'SourceConnection') : 
        etree.SubElement (xdevice, 'model').text = activity.SourceConnection.Service.ID 
etree.SubElement (xworkout, 'time').text = activity.StartTime.replace (tzinfo = None).isoformat () 
    def _writeMinMaxAvg(xparent, name, stat, naturalValue = False) : 
        if ((stat.Min is None) and (stat.Max is None) and (stat.Average is None)) : 
            return 
xstat = etree.SubElement (xparent, name) 
        if (stat.Min is not None) : 
            xstat.attrib ['min'] = str (stat.Min) 
if (stat.Max is not None) : 
            xstat.attrib ['max'] = str (stat.Max) 
if (stat.Average is not None) : 
            xstat.attrib ['avg'] = str (stat.Average) 
def _writeSummaryData(xparent, obj, time_ref) : 
        xsummary = etree.SubElement (xparent, 'summarydata') 
        etree.SubElement (xsummary, 'beginning').text = str ((obj.StartTime - time_ref).total_seconds ()) 
        etree.SubElement (xsummary, 'duration').text = str ((obj.EndTime - obj.StartTime).total_seconds ()) 
        if (obj.Stats.TimerTime.Value is not None) : 
            etree.SubElement (xsummary, 'durationstopped').text = str (((obj.EndTime - obj.StartTime).total_seconds () - obj.Stats.TimerTime.asUnits (ActivityStatisticUnit.Seconds).Value)) 
altStat = obj.Stats.Elevation.asUnits (ActivityStatisticUnit.Meters) 
        _writeMinMaxAvg...

    
    

    Fix the buggy line: etree.SubElement (xsample, 'spd').text = str (xsample.Speed)
assistant
#Here is Python code to fix the buggy line: etree.

etree.SubElement (xsample, 'spd').text = str (wp.Speed)