How to fix statement seems to have no effect

[hernancrespo89]

Hi, i know there are similar questions but they didn't solve my problem. I have been trying to read brightness of my webcam using OpenCV and QT. I have tried to implement my codes on 3 different files (main,view,model). I created get_brightness in models.py and i call it on views.py but i see statement has no effect warning, and print_brightness never works.

main.py

from PyQt5.QtWidgets import QApplication from views import UI_Window from models import Camera if __name__ == '__main__': #hangi dosyaya sag tiklayip Run dersek o dosya main oluyor. eger dosya main ise kosul saglanmis oluyor. camera = Camera(0) #0, webcam numarasi app = QApplication([]) start_window = UI_Window(camera) start_window.show() app.exit(app.exec_())

views.py

from PyQt5.QtCore import QThread, QTimer from PyQt5.QtWidgets import QLabel, QWidget, QPushButton, QVBoxLayout, QApplication, QHBoxLayout, QMessageBox, QMainWindow from PyQt5.QtGui import QPixmap, QImage from models import Camera class UI_Window(QWidget): def __init__(self, cam_num): super().__init__() self.cam_num = cam_num self.cam_num.open() # Create a timer. self.timer = QTimer() self.timer.timeout.connect(self.nextFrameSlot) self.timer.start(1000. / 24) self.print_brightness def nextFrameSlot(self): frame = self.cam_num.read() if frame is not None: image = QImage(frame, frame.shape[1], frame.shape[0], QImage.Format_RGB888) #	The image is stored using a 24-bit RGB format (8-8-8). self.pixmap = QPixmap.fromImage(image) def print_brightness(self): print(Camera.get_brightness())

models.py

import cv2 class Camera: def __init__(self, cam_num): self.cap = cv2.VideoCapture(cam_num) self.cam_num = cam_num def open(self, width=640, height=480, fps=30): # vc.set(5, fps) #set FPS self.cap.set(3, width) # set width #propID =3 yani 3.property si width. 3.property i 480 yap self.cap.set(4, height) # set height return self.cap.isOpened() def read(self): rval, frame = self.cap.read() frame = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB) return frame def get_brightness(self): return self.cap.get(cv2.CAP_PROP_BRIGHTNESS)