Buffer for features selected in the mapcanvas and writing to csv file

I have some features selected by using "Select Features by Freehand" tool in QGIS and try to find the buffer for those selected features alone and write the city and state names within in the buffer to a csv file. My code and image is attached for a clear understanding. it is writing an csv file in the given location but nothing is found inside the csv.Any help would be appreciated.

And my code is

import csv
layer = qgis.utils.iface.activeLayer()
features = layer.selectedFeatures()
mbuf = feature.geometry().buffer(50, 2)
iterFeat = layer.getFeatures()
for f in iterFeat:
  geom2 = f.geometry()
  valTest = QgsGeometry.within(geom2, mbuf)
  if valTest:
    idx = layer.fieldNameIndex('name')
    idx1 = layer.fieldNameIndex('state')
    nearCity = f.attributes()[idx]
    state = f.attributes()[idx1]
    state_and_cities = str(state) + "," + nearCity
    lsNearCities.append(state_and_cities)
    filteredFields = []
    for feature in features:
        attrs = lsNearCities
    with open('E:/Kcube/test2.csv', 'w') as csvfile:
       writer = csv.writer(csvfile, delimiter=',')
       for field in filteredFields:
       writer.writerow(field)