How to get the particular process cpu usage from task manager in windows using python?

You can use psutil library.

For getting process

import psutil
p = psutil.Process(<ProcessID>)
print(p.cpu_percent(interval=1.0))

This will give you the float representation of the current system-wide CPU utilization as a percentage by a process.

Also if you are having any trouble in retrieving any running process PID you can again use psutil library as :

import psutil
for proc in psutil.process_iter():
    if proc.name() == <Some Running Process Name> :
        try:
            pinfo = proc.as_dict(attrs=['pid'])
        except psutil.NoSuchProcess:
            pass
        else:
            print(pinfo)

It will give you pid inside a dictionary thou.