[caption id="attachment_646" align="alignnone" width="300"] Prime Multi Treading[/caption] Added some Multi Threading to my code to get full advantage of the dual core on my laptop:

import threading import time import inspect import sqlite3 import math

class Thread(threading.Thread): def __init__(self, t, *args): threading.Thread.__init__(self, target=t, args=args) self.start()

global variables

count = 0 lock = threading.Lock()

primeList = [] dbname='/home/roberto/primelist.db' table_name = 'primes' # name of the table to be created new_field = 'prime' # name of the column field_type = 'INTEGER' # column data type

def createDB():

Connecting to the database file

conn = sqlite3.connect(dbname)
c = conn.cursor()
try:
    #c.execute('select prime from primes')
    #primeList = c.fetchall()
     for row in  c.execute('select prime from primes order by prime'):
        primeList.append(int(row\[0\]))

except:
    # Creating a new SQLite table with 1 column
    c.execute('CREATE TABLE {tn} ({nf} {ft})'\\
            .format(tn=table\_name, nf=new\_field, ft=field\_type))

# Committing changes and closing the connection to the database file
conn.commit()
conn.close()

def add_prime(prime):

conn=sqlite3.connect(dbname,  timeout = 30000)
curs=conn.cursor()

curs.execute("INSERT INTO primes values((?))", (prime,))

# commit the changes
conn.commit()

conn.close()

def isPrime(num):

prime numbers are greater than 1

if num > 1:
   # check for factors
   for i in range(len(primeList)):
       if ((num % primeList\[i\]) == 0 ) :
           print(num,"is not a prime number")
           #print(i,"times",num//i,"is",num)
           break
       if ((num / primeList\[i\]) < 2):
            print(num,"is a prime number")
            primeList.append(num)
            add\_prime(num)
            break
   else:
       #print(num,"is a prime number")
       primeList.append(num)
       add\_prime(num)

# if input number is less than
# or equal to 1, it is not prime
else:
   print(num,"is not a prime number")

def incre(): global count

if len(primeList) == 0:
    createDB()
    if len(primeList) == 0:
        count = 0
    else:
        count = primeList\[len(primeList)-1\]+1
caller = inspect.getouterframes(inspect.currentframe())\[1\]\[3\]
print "Inside %s()" % caller
print "Acquiring lock"

with lock:
    print "Lock Acquired"
    #print (count)
    num = count
    count += 1  
    isPrime(num)

def bye(): while count < math.pow(10, 101): incre()

def hello_there(): while count < math.pow(10, 101): incre()

def main():
hello = Thread(hello_there) time.sleep(10)
goodbye = Thread(bye)

if __name__ == '__main__': main()