[已解决]小白困惑

昨非

def sum(a,b):
    print('=%d' % (a+b))

def reduction(a,b):
    print('=%d' % (a-b))

def multiplication(a,b):
    print('=%d' % (a*b))

def division(a,b):
    print('=%f' % (a/b))

def aliquot(a,b):
    print("=%d" % (a//b))

def morethan(a,b):
    print("=%d" % (a%b))

judge = 1

while judge:
    re = input()
    if '+' in re:
        a = int(re.split('+')[0])
        b = int(re.split('+')[1])
        sum(a, b)

    elif '-' in re:
        a = int(re.split('-')[0])
        b = int(re.split('-')[1])
        reduction(a, b)

    elif '*' in re:
        a = int(re.split('*')[0])
        b = int(re.split('*')[1])
        multiplication(a, b)

    elif '//' in re:
        a = int(re.split('//')[0])
        b = int(re.split('//')[1])
        aliquot(a, b)
    elif '/' in re:
        a = float(re.split('/')[0])
        b = float(re.split('/')[1])
        division(a, b)
    elif '%' in re:
        a = int(re.split('%')[0])
        b = int(re.split('%')[1])
        morethan(a, b)

    elif re=='Q' or re=='q':  #这里不对，re='Q'or'q'永远为true
        break

    else:
        print("输入有误，请重新输入...")
        continue

昨非

re == 'Q' or 'q'
等价于，re =='Q' or 1
等价于 1
所以你输入的除了加减乘除之外的所有情况全部被break掉了