[Tutor] Threads threads threads gaaahgh (foaming at the mouth)

[Hanna Joo]

Big thanks to those who helped me. This is the updated version of the
producer consumer thing.

The problem now is getting 'notify' and 'wait' working. The reference book
says that I those are the methods of condition variables (boohoohoo english
is not even my first language and people do this to me). I went through
chapters on threads again, but I still don't really get it. help please
T_____T  (tears streaming down).

TIA



import threading
from random import randint


class Soup:

 def __init__(self):
  self.next = 0
  self.isFull = 0
  self.isEmpty = 1
  self.buff = ""

 def eat(self):

  while self.isEmpty:
   try : wait()  #########
   except: pass

  self.next = self.next - 1

  if not self.next:
   self.isEmpty = 1

  self.isFull = 0
  notify()     ########=======> how to do this?

  return self.buff[next]


 def add(self,c):
  while self.isFull:
   try: wait()    ########===========> this as well
   except: pass
  self.buff = self.buff[:self.next]+c+self.buff[self.next:]
  self.next += 1

  if self.next == len(self.buff):
    self.isFull= 1
  self.isEmpty = 0
  notify()     #####

class Consumer:


 def __init__(self,soup):
  self.soup = soup

 def run(self):

  for i in range(10) :
   c = self.soup.eat();
   print "Ate a letter "+c

   try:
    sleep(randint(1,3))

   except:
    pass

class Producer:


 def __init__(self,soup):
  self.soup = soup
  self.alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"

 def run(self):

  for i in range(10):
   c = self.alphabet[randint(1,27)]
   self.soup.add(c);
   print "Added "+c+" to the soup"
   try: sleep(randint(1,3))
   except: pass


def main():

 s = Soup()

 p1 = Producer(s)
 s1 = Consumer(s)

 t1 = threading.Thread(target=p1.run)
 t2 = threading.Thread(target=s1.run)

 t1.start()
 t2.start()

 try :

  t1.join()
  t2.join()

 except:

  print "The producer or consumer thread's join() was interrupted..."



if __name__ == '__main__':
 main()