So you’re wondering, how do you get the CPU temperature on a Raspberry Pi? Well, remember that both the CPU and the GPU on the Raspberry Pi are one-in-the-same, so you go about this by getting the GPU temperature. Now, ideally you could use the standard Linux kernel information files, but when I tried to use them, it failed, so I instead had to use proprietary VidCore Broadcom means.
20180906/DuckDuckGo raspberry pi acpi cpu temperature
20180906/https://www.cyberciti.biz/faq/linux-find-out-raspberry-pi-gpu-and-arm-cpu-temperature-command/
Proprietary Broadcom means, requires root access:
vcgencmd measure_temp
Standard Linux means:
cat /sys/class/thermal/thermal_zone0/temp
And if you want to make a whole complicated programming project out of
this, look here. This uses the gpiozero library to get the
information, again non-standard for everything else except the
Raspberry Pi.
20180906/https://projects.raspberrypi.org/en/projects/temperature-log