通过使用if else语句，通过输入的身高体重计算bmi

Author: JesseZhen

Base/Samples/BMI.py

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+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+print('输入身高')
+height = input()
+height = float(height)
+print('输入体重')
+weight = input()
+weight = float(weight)
+bmi = (weight/height**2)  #**2表示2次方 如果为3则为3次方
+if bmi<18.5:
+    print('过轻')
+elif 18.5<=bmi<25:
+    print('正常')
+elif 25<=bmi<28:
+    print('过重')
+elif 28<=bmi<32:
+    print('肥胖')
+elif bmi>=32:
+    print('严重肥胖')