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Python

opencv's CascadeClassifier

So I currently installed opencv and started playing with it, i got this error in which i researched on the internet looking for answers but nothing worked. The error say : TypeError: 'cv2.CascadeClassifier' object is not callable

Here's my code if you're wondering:

import numpy as np
    import cv2

    cap = cv2.VideoCapture(0)


    face_cascade = cv2.CascadeClassifier("haarcascade_frontalface_default.xml")

    eye_cascade = cv2.CascadeClassifier("haarcascade_frontalface_default.xml")

    while True:
        ret, frame = cap.read()

        gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)

        for (x, y, w, h) in face_cascade(gray, 1.3, 5):
            frame = cv2.rectangle(frame, (x, y), (x + w, y + h), (255, 255, 255), 2)
            roi_gray = gray[y:y + h, x:x + w]
            roi_color = frame[y:y + h, x:x + w]
            eyes = eye_cascade.detectMultiScale(roi_gray)
            for (ex, ey, ew, eh) in eyes:
                cv2.rectangle(roi_color, (ex, ey), (ex + ew, ey + eh), (0, 255, 0), 2)

        cv2.imshow('Video', frame)
        if cv2.waitKey(1) & 0xFF == ord('q'):
            break


    cap.release()
    cv2.destroyAllWindows()

Any suggestions for why the error is showing up ?? p.s , i have installed all the files for the library including the haarcascade xml files.