BMI.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Created on Tue Mar  7 14:16:50 2023

@author: markwin
"""

import streamlit as st
import matplotlib.pyplot as plt

st.title("Welcome to BMI calculator")

#Input

weight = st.number_input("Enter your weight in KG", step = 0.1)

height = st.number_input("Enter your height in Meters", step = 0.01)

def calculate_bmi():
    bmi = weight/(height)**2
    bmi_thresholds = [18.5, 23, 29.9]
    level_labels = ['Risk of nutritional deficiency','Low Risk','Moderate Risk','High Risk']
    if bmi <= bmi_thresholds[0]:
        level = level_labels[0]
    elif bmi <= bmi_thresholds[1]:
        level = level_labels[1]
    elif bmi <= bmi_thresholds[2]:
        level = level_labels[2]
    else:
        level = level_labels[3]
    st. success(f"Your BMI is {bmi}. You are at {level}")

def plot_bmi_chart():
    categories = ["Underweight", "Normal", "Overweight", "Obese"]
    values = [18.5, 23, 29.9, float("inf")]

    plt.figure(figsize=(8, 4))
    plt.bar(categories, values[:-1], color="skyblue")
    plt.xlabel("BMI Category")
    plt.ylabel("BMI Threshold")
    plt.title("BMI Categories")
    plt.ylim(0, 40)
    plt.grid(axis="y")
    st.pyplot(plt)



button = st.button("Calculate BMI")
if button:
    calculate_bmi()
button = st.button("See Chart")
if button:
    plot_bmi_chart()