Gevent thread pool example of mixing

main.py

#!/usr/bin/python
import random
from math import log, exp
import string
from gevent import sleep, spawn, joinall, wait
from gevent.threadpool import ThreadPool

def random_string():
    digits = "".join( [random.choice(string.digits) for i in xrange(8)] )
    chars = "".join( [random.choice(string.letters) for i in xrange(10)] )
    return chars

def delay_message(message, delay):
    sleep(delay)
    print("Shuffled message: {} and time: {}". format(message, delay))

def get_delay():
    u = random.SystemRandom().random()
    tau = 10 # maximum bound
    x = -log(1 - (1 - exp(-tau)) * u);
    print(u)

def main():
    tasks = ThreadPool(25)
    while True:
        s = raw_input("Please continue pressing enter, messages will appear when they are ready")
        if s == "":
            delay = random.randint(0, 6)
            string = random_string()
            print("Message: {} and time: {}". format(string, delay))
            #tasks = []
            tasks.spawn(delay_message, string, delay)
            
            if (random.randint(0,10) == 5): # random condition in breaking
                wait()
                break
        else:
            print("Exiting")
            break
        
if __name__ == "__main__":
    main()