How to Install OpenCV-Python in Raspberry pi || without any error ||Tv

How to Install OpenCV-Python in Raspberry pi 3B+ without any error just copy and pest below code....

code:--
sudo apt-get purge wolfram-engine -y
sudo apt-get purge libreoffice* -y
sudo apt-get clean
sudo apt-get autoremove -y

sudo apt-get update
sudo apt-get upgrade

sudo apt-get install python-opencv

sudo apt-get install build-essential cmake pkg-config
sudo apt-get install libjpeg-dev libtiff5-dev libjasper-dev libpng12-dev
sudo apt-get install libavcodec-dev libavformat-dev libswscale-dev libv4l-dev
sudo apt-get install libxvidcore-dev libx264-dev
sudo apt-get install libgtk2.0-dev libgtk-3-dev
sudo apt-get install libatlas-base-dev gfortran
sudo apt-get install libqtgui4
sudo modprobe bcm2835-v4l2
sudo apt-get install libqt4-test

sudo apt-get install python3-dev
sudo apt-get install python3-pip

pip3 install opencv-python

IF ERROR(ImportError: undefined symbol: __atomic_fetch_add_8)

pip3 install opencv-python==3.4.6.27

#installing opencv-python in raspberrpi
#opencv-python
#raspberrypi

thanks you..........

[FarhanAli-tnqw]

Hi I am getting error in this command $ sudo apt-get install libjpeg-dev libtiff5-dev libjasper-dev libpng12-dev the error is Unable to locate package libjasper-dev E: Package 'libpng12-dev' has no installation candidate please help me