Take a snapshot with the webcam in python?

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So I am trying a write a program to detect objects using openCV libraries using Python.

The code to detect object is somewhat satisfactory. When I run the code, it opens the webcam and when the object the system has been trained to detect is visible with the cam it detects it and draws a rectangle and writes what the object is. So far so good. However I want the program to take a snap for the first time it detects something. And close the webcam and shows the pic instead. Here's the code I have written so far:

import cv2
import numpy as np


cascade1 = cv2.CascadeClassifier('xcascade.xml')
cascade2 = cv2.CascadeClassifier('ycascade.xml')

def TakeSnapAndSave():
    cap = cv2.VideoCapture(0)

    num = 0
    while num<1000:
        ret, img = cap.read()
        gray = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)

        object1 = xcascade.detectMultiScale(gray, 10, 10)
        for(x,y,w,h) in object1:
            font = cv2.FONT_HERSHEY_SIMPLEX
            cv2.rectangle(img,(x,y), (x+w,y+h),(255,255,0),5)
            cv2.putText(img, 'Something',(x,y-40), font, 1.5, (255,255,0),5, cv2.LINE_AA)
            object2 = ycascade.detectMultiScale(gray, 15, 15)
            for(x,y,w,h) in object2:
                font = cv2.FONT_HERSHEY_SIMPLEX
                cv2.rectangle(img,(x,y), (x+w,y+h),(0,255,255),5)
                cv2.putText(img, 'Something Else',(x+100,y+80), font, 0.8, (0,0,255),2, cv2.LINE_AA)        


        cv2.imwrite('opencv'+str(num)+'.jpg',img)
        num = num+1
    cap.release()
    cv2.destroyAllWindows()

The code keeps taking snapshots without doing any detection.....