python: restarting a loop

Question

i have:

for i in range(2,n):
    if(something):
       do something
    else:
       do something else
       i = 2 **restart the loop

But

Answer 1

Here is an example using a generator's send() method:

def restartable(seq):
    while True:
        for item in seq:
            restart = yield item
            if restart:
                break
        else:
            raise StopIteration

Example Usage:

x = [1, 2, 3, 4, 5]
total = 0
r = restartable(x)
for item in r:
    if item == 5 and total < 100:
        total += r.send(True) 
    else:
        total += item