How to measure processing time in Python or Java

# -*- coding: utf-8 -*-
import time

# main
if __name__ == "__main__":

    #Start time
    startTime = time.time()
    
    #Processing of measurement target
    # processing

    #End time
    endTime = time.time()
    
    #Display of processing time
    print(endTime - startTime)

public class TimeWatchDemo {
    
    public static void main(String[] args) {

        //Start time
        long startTime = System.nanoTime();
        
        //Processing of measurement target
        // processing
        
        //Completion time
        long endTime = System.nanoTime();
        
        //Display of processing time
        System.out.println(endTime - startTime);
    }
}

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