How to reuse Thread in Python

Question

I want to take noPairs and noThreads as a input from user. For example calculate shortest path between 4 pairs using only 2 threads. But in my code for every pair multiple threads are created. Instead i want to create given number of threads and then perform operations using them. Can someone help me.

My code :

import threading
from py2neo import neo4j
from random import randint
#------------------------------------------------------------------------------ 

TOTAL = 0
MY_LOCK = threading.Lock()

class TestJVM(threading.Thread):

    def __init__(self,s_node,e_node):
        """
            Default constructor
        """
        self.graph_db = neo4j.GraphDatabaseService("http://localhost:7474/db/data/")
        self.query_string = """START beginning=node(%s), end=node(%s) 
                            MATCH p = shortestPath(beginning-[*]-end) 
                            RETURN p"""%(s_node,e_node)                     # Pass start and end node values
        threading.Thread.__init__(self)


    def run(self):
        """
            Run method
        """
        MY_LOCK.acquire()
        result = neo4j.CypherQuery(self.graph_db,self.query_string).execute()
        for r in result:
            print(r.p) # p is a py2neo.neo4j.Path object
        MY_LOCK.release()


if __name__ == "__main__":

    try:
        noThreads = int(input("Enter Number of Threads : "))
        noPairs = int(input("Enter Number of Pairs : "))                    # Take number of pairs as a input    
        for i in range(0,noPairs):        
            start_node = randint(0,20);                                     # Enter range for generating random numbers
            end_node = randint(0,20);                                       # Enter range for generating random numbers            
            print("start node is : %s and end node is : %s"%(start_node,end_node) )
            for t in range(0,noThreads):
                a = TestJVM(start_node,end_node)
                a.start()

    except Exception as e:
        print(e)