Help! Show coordinates face detection

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Hi! i need calculate the distance between two o more faces (the faces are inside rectangle, because i am using facedetection code in python), and if two or more faces are together(rectangles together) then print " faces together". if(distance(face1 and face2)<= "n" pixel) {print "faces together"} #n = your calibrate distance. I do not know how translate this order to python language, somebody can help me? Thanks. this is the code:

i am using other code with opencv 2.4.9, this code:

#Ejemplo de deteccion facial con OpenCV y Python
#Por Glare
#www.robologs.net

import numpy as np
import cv2

#cargamos la plantilla e inicializamos la webcam:
face_cascade = cv2.CascadeClassifier('haarcascade_frontalface_alt.xml')
cap = cv2.VideoCapture(0)

while(True):
#leemos un frame y lo guardamos
ret, img = cap.read()

#convertimos la imagen a blanco y negro
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
hsv = cv2.cvtColor(img, cv2.COLOR_BGR2HSV)
#buscamos las coordenadas de los rostros (si los hay) y
#guardamos su posicion
faces = face_cascade.detectMultiScale(gray, 1.3, 5)

#Dibujamos un rectangulo en las coordenadas de cada rostro
for (x,y,w,h) in faces:
    cv2.rectangle(img,(x,y),(x+w,y+h),(125,255,0),2)


#Mostramos la imagen
cv2.imshow('img',img)

#con la tecla 'q' salimos del programa
if cv2.waitKey(1) & 0xFF == ord('q'):
    break
cap.release()
cv2-destroyAllWindows()