Generates booklets

booklet.py

def gen_booklet(pages):
    
    # se nao for multiplo de 4
    if (len(pages) % 4 != 0):
        # extende a lista ate ser multiplo de 4
        # 'E' significa Empty page
        pages += ['E'] * (4 - len(pages) % 4)
    
    res = []
    for i, v in enumerate(pages):
        left = pages[i]
        right = pages[-i-1]
        if left < right:
            # se for par troca a ordem
            r = (right, left) if i % 2 == 0 else (left, right)
            res.append(r)
        
    return res


# Testar booklets com paginas de 1 a 50
for i in range(1, 50):
    print "-----\n %s Paginas" % i
    print gen_booklet(range(1,i+1))