To get the streaming feed from your Wyze camera v3 in python, you need to enable the RTSP protocol in you camera application.
You can download the RTSP firmware for v3 cam from this link: https://download.wyzecam.com/firmware/rtsp/demo_v3_RTSP_4.61.0.1.zip
To install the RTSP enabled firmware, you can follow the steps defined in this link: https://support.wyze.com/hc/en-us/articles/360026245231-Wyze-Cam-RTSP
After that, connect the camera over a wireless network and your PC. Run the WiFi camera streaming script to get your streaming using python and opencv