Python for Bioinformatics: tic-tac-toe: loop detail

Friday, August 7, 2009

tic-tac-toe: loop detail

In the program I'm writing, I have code structured like this:

for i in range(2):
    print 'i', i
    for p in 'xy':
        print 'p', p
        if True:
            continue

What I want is to continue back to the next i (outer loop), rather than the next p (inner loop). This code doesn't do that:

i 0
p x
p y
i 1
p x
p y

It's not elegant, but what I did was add a flag labeled C. We check the value of C before starting the inner loop.

for i in range(2):
    print 'i', i
    C = False
    for p in 'xy':
        if C:  continue
        print 'p', p
        if True:
            C = True

That does what I want:

i 0
p x
i 1
p x