def adder():
# In Python you "import" a global variable, instead of "export"ing it when you declare it
global i
# In Python 2 this generates a list of integers (which takes time),
# while in Python 3 this is an iterable (which is much faster to generate).
# In python 2, an iterable is created with xrange()
for x in range(0, 1000000):
Lock.aqcuire(False)
i += 1
Lock.aqcuire(True)
def sub():#
global i
for x in range(0, 1000000):
Lock.acquire(False)
i-=1
Lock.aqcuire(True)
