Python 3.x 在矩阵中放入一个范围并使用python取出一个特定的数字

我是python新手，我想知道我是否可以在矩阵或数组中设置包含范围的多个变量，而不列出中间的所有数字。目前我的代码看起来像这样

underweight = range(1,20)
normal = range(20,26)
prettyfatty = range(26,31)
relyfatty = range(31,40)
......
......
class funke:
    def diff(*args):
        if BMI.vari(kiya,kiki) in underweight:
            try:
                ok = underweight[0]
                top1 = ok - BMI.vari(kiya,kiki)
                tweight1 = (top1/703)*height**2
                print("You will need to gain" + " " + tweight1 + "pounds to go up a tier. You shouldnt try to lose more weight")
            else:
                pass

        elif BMI.vari(kiya,kiki) in normal:
            try:
                ok = normal[-1]
                ko = normal[0]
                top2 = ok - BMI.vari(kiya,kiki)
                bottom2 = BMI.vari(kiya,kiki) - ko
                tweight2 = (top2/703)*height**2
                bweight2 = (bottom2/703)*height**2
                print("You will need to gain" + " " + tweight2 + "pounds to go up a tier and lose " + bweight1 " to go down a tier")
            else:
                pass

        elif BMI.vari(kiya,kiki) in prettyfatty:
            try:
                ok = prettyfatty[-1]
                ko = prettyfatty[0]
                top3 = ok - BMI.vari(kiya,kiki)
                bottom3 = BMI.vari(kiya,kiki) - ko
                tweight3 = (top3/703)*height**2
                bweight3 = (bottom3/703)*height**2
                print("You will need to gain" + " " + tweight3 + "pounds to go up a tier and lose " + bweight1 " to go down a tier")
            else:
                pass

        elif BMI.vari(kiya,kiki) in relyfatty:
            try:
                ok = relyfatty[-1]
                ko = relyfatty[0]
                top4 = ok - BMI.vari(kiya,kiki)
                bottom4 = BMI.vari(kiya,kiki) - ko
                tweight4 = (top4/703)*height**2
                bweight4 = (bottom4/703)*height**2
                print("You will need to gain" + " " + tweight4 + "pounds to go up a tier and lose " + bweight1 " to go down a tier")
            else:
                pass

        else BMI.vari(kiya,kiki) > relyfatty[-1]:
            try:
                ok = relyfatty[0]
                top5 = BMI.vari(kiya,kiki) - ok
                tweight5 = (top1/703)*height**2
                print("You will need to lose" + " " + tweight5 + "pounds to go down a tier and you really should")
            else:
                print("Something went wrong"

不是每次调用每个权重类数据集，而是可以将它们组合起来吗？我想得到第一个和最后一个变量来做一些数学计算，但我想看看是否有更好的方法。任何想法都会有帮助