输入您的身高 体重 性别
计算出你的体重是否标准
gender = input('请输入您的性别(boy or girl):')height = input('请输入您的身高（单位cm）:')height = float(height)weight = input('请输入您的体重（单位kg）:')weight = float(weight)if gender == 'boy': print('您的性别：男') standard = (height - 100)*0.9 if standard*1.5 < weight: print('重度肥胖！！！请您加强锻炼．') elif standard*1.3 < weight: print('中度肥胖！！！') elif standard*1.2 < weight: print('轻度肥胖！！！') elif standard*1.1 < weight: print('超重！！！') elif standard*0.9 < weight: print('恭喜您，体重正常！') else : print('您体重过低，请加强营养和锻炼！')elif gender == 'girl': print('您的性别：女') standard = (height - 100)*0.9 - 2.5 if standard*1.5 < weight: print('重度肥胖！！！请您加强锻炼．') elif standard*1.3 < weight: print('中度肥胖！！！') elif standard*1.2 < weight: print('轻度肥胖！！！') elif standard*1.1 < weight: print('超重！！！') elif standard*0.9 < weight: print('恭喜您，体重正常！') else : print('您体重过低，请加强营养和锻炼！')
采用if-elif-else比采用两个if语句运行要快
