<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:

def profile(request):
    '''
        Viewing of signup details and editing of password
    '''
    context = {}

    if request.method == 'POST':
        form = PasswordChangeForm(request.user, request.POST)
        if form.is_valid():
            form.save()
            messages.info(request, 'Password Changed.')
    else:
        form = PasswordChangeForm(request.user)

    key = Key.objects.get(email=request.user.email)
    
    #analytics
    endpoint_q = key.reports.values('api__name', 'endpoint').annotate(calls=Sum('calls')).order_by('-calls')
    endpoints = [{'endpoint':'.'.join((d['api__name'], d['endpoint'])),
                  'calls': d['calls']} for d in endpoint_q]
    date_q = key.reports.values('date').annotate(calls=Sum('calls')).order_by('date')
    context['endpoints'], context['endpoint_calls'] = _dictlist_to_lists(endpoints, 'endpoint', 'calls')
    context['timeline'] = date_q

    context['form'] = form
    context['key'] = key
    context['password_is_key'] = request.user.check_password(key.key)
    return render_to_response('locksmith/profile.html', context,
                              context_instance=RequestContext(request))