thread3.py

import threading
import time

def blocking_1():
  print("thread start 1")
  time.sleep(10)
  print("thread finished 1")

def blocking_2():
    print("thread start 2")
    time.sleep(5)
    print("thread finished 2")

def blocking_3():
    print("thread start 3")
    time.sleep(8)
    print("thread finished 3")
  
def main():
    t1 = threading.Thread(target=blocking_1, name="blocking_task")
    t2 = threading.Thread(target=blocking_2, name="blocking_task")
    t3 = threading.Thread(target=blocking_3, name="blocking_task")
    t1.start()
    t2.start()
    t3.start()
    t1.join()
    t2.join()
    t3.join()
    
start_time = time.perf_counter()  
main()
print("process exited")
end_time = time.perf_counter()  
execution_time = end_time - start_time  
print(f"\nExecuting - {__file__}\nExecution Starts: {start_time}\nExecutions Ends: {end_time}\nTotals Execution Time:{execution_time:0.2f} seconds.")