再请教一个 Python if 语句的写法

[coolair]

if A1:
    if A2 == X2:
        if B1:
            if B2 == Y2:
                do_something()
            else:
                print 'B2 must equal to Y2'
        else:
            do_something()
    else:
         print 'A2 must equal to X2'
elif B1:
    if B2 == Y2:
        do_something()
    else:
        print 'B2 must equal to Y2'
else:
    print 'Choose at least one between A1 and B1'

[pktangyue]

if not A1 and not B1:
print 'Choose at least one between A1 and B1'
return
if A1 and A2 != X2:
print 'A2 must equal to X2'
return
if B1 and B2 != Y2:
print 'B2 must equal to Y2'
return

do_something()

[xmadi]

。。。。 这个和语法没有关系了 纯粹是逻辑归纳能力不行