坐标迭代

cornersA = []
p=0
q=0
i=0
while p<=5000:
    w=[]
    w=(p,q)
    p+=100
    q+=200
    i+=1


    cornersA.append(w)
print 'cornersA=',cornersA

---------------------------------------------------------------

p=0

w = []
while p<5000:
    p+=100
    q=0

    while q<=4000:
        w=(p,q)
        q+=100
        cornersA.append(w)
    else:continue
else:
    pass
print 'cornersA=',cornersA