from pywebio.input import input, FLOAT
from pywebio.output import put_text
class BMICalculator:
   def __init__(self):
      self.height = None
      self.weight = None
      self.bmi = None
      self.classification = None

   def calculate_bmi(self):

      # 获取用户的身高和体重
      self.height = input("请输入您的身高（米）：", type=FLOAT)
      self.weight = input("请输入您的体重（千克）：", type=FLOAT)

      # 计算BMI
      self.bmi = self.weight / (self.height ** 2)

      # 确定BMI分类
      if self.bmi < 16:
         self.classification = "严重偏瘦"
      elif self.bmi < 18.5:
         self.classification = "偏瘦"
      elif self.bmi < 25:
         self.classification = "正常（健康体重）"
      elif self.bmi < 30:
         self.classification = "超重"
      elif self.bmi < 35:
         self.classification = "中度肥胖"
      else:
         self.classification = "严重肥胖"

      # 向用户显示结果
      put_text("根据您的身高为{}米，体重为{}千克，您的BMI为{:.1f}。这意味着您被归类为{}。".format(self.height, self.weight, self.bmi, self.classification))

      # 创建BMICalculator对象
      bmi_calculator = BMICalculator()

      # 计算BMI并显示结果
      bmi_calculator.calculate_bmi()

根据您的身高为1.7米，体重为65千克，您的BMI为22.5。这意味着您被归类为正常（健康体重）。

from pywebio.input import *
from pywebio.output import *
from pywebio import start_server
def calculate_bmi():
   height = input("输入身高（以厘米为单位）", type=FLOAT)
   weight = input("输入体重（以千克为单位）", type=FLOAT)
   bmi = weight / ((height/100) ** 2)
   bmi = round(bmi, 2)
   weight_category = ""
   if bmi < 18.5:
      weight_category = "体重过轻"
   elif 18.5 <= bmi <= 24.9:
      weight_category = "正常体重"
   elif 25 <= bmi <= 29.9:
      weight_category = "超重"
   else:
      weight_category = "肥胖"
   put_text("你的BMI是: %s" % bmi)
   put_text("你属于%s" % weight_category)
   if __name__ == '__main__':
      start_server(calculate_bmi, port=80, debug=True, title="BMI计算器", button_text="计算BMI")

你的BMI是: 21.22
你属于正常体重