human
Solve the following python programming problem given the following code:
def Parse(pwxData, activity = None) : 
    ns = copy.deepcopy (PWXIO.Namespaces) 
    ns ['pwx'] = ns [None] 
    del ns [None] 
    activity = (activity if activity else Activity ()) 
    try : 
        root = etree.XML (pwxData) 
except : 
        root = etree.fromstring (pwxData) 
xworkout = root.find ('pwx:workout', namespaces = ns) 
    xsportType = xworkout.find ('pwx:sportType', namespaces = ns) 
    if (xsportType is not None) : 
        sportType = xsportType.text 
        if (sportType in PWXIO._sportTypeMappings) : 
            if (PWXIO._sportTypeMappings [sportType] != ActivityType.Other) : 
                activity.Type = PWXIO._sportTypeMappings [sportType] 
xtitle = xworkout.find ('pwx:title', namespaces = ns) 
    if (xtitle is not None) : 
        activity.Name = xtitle.text 
xcmt = xworkout.find ('pwx:cmt', namespaces = ns) 
    if (xcmt is not None) : 
        activity.Notes = xcmt.text 
xtime = xworkout.find ('pwx:time', namespaces = ns) 
    if (xtime is None) : 
        raise ValueError ("Can't parse PWX without time") 
activity.StartTime = dateutil.parser.parse (xtime.text) 
    activity.GPS = False 
    def _minMaxAvg(xminMaxAvg) : 
        return { 
            'min' : (float (xminMaxAvg.attrib ['min']) if ('min' in xminMaxAvg.attrib) else None), 
            'max' : (float (xminMaxAvg.attrib ['max']) if ('max' in xminMaxAvg.attrib) else None), 
            'avg' : (float (xminMaxAvg.attrib ['avg']) if ('avg' in xminMaxAvg.attrib) else None), 
} 
def _readSummaryData(xsummary, obj, time_ref) : 
        obj.StartTime = (time_ref + timedelta (seconds = float (xsummary.find ('pwx:beginning', namespaces = ns).text))) 
        obj.EndTime = (obj.StartTime + timedelta (seconds = float (xsummary.find ('pwx:duration', namespaces = ns).text))) 
        stoppedEl = xsummary.find ('pwx:durationstopped', namespaces = ns) 
        if (stoppedEl is not None) : 
            obj.Stats.TimerTime = ActivityStatistic (ActivityStatisticUnit.Seconds, value = ((obj.EndTime - obj.StartTime).total_seconds...

    
    

    Fix the buggy line: if (not len (xsample)) :
assistant
#Here is Python code to find ('pwx:workout', namespaces = ns) 
.

if (not len (laps)) :