[code python]import thread
from time import sleep
l=thread.allocate_lock()


def fun():
    while True:
            print('function1')
            sleep(1)
            global p+=1

def by():
    while True:     
        sleep(1)
        if ( global p>10):
        	pass
        print('function2')


while True:
	global p=0
	l=thread.allocate_lock()
	potok1=thread.start_new_thread(fun,())
	sleep(0.5)
	potok2=thread.start_new_thread(by,())
	sleep(3)
	l.acquire()
	sleep(3.5)
	l.release()[/code]

global p+=1 # неправильно !
 
global p  # это
p+=1 # правильно

a=1
def foo():
	global a
	print a
	a=2
	
	def spam():
		a+=1
		print a
	spam()
foo()