app.py

import streamlit as st

def convert_temperature(value, from_unit, to_unit):
    if from_unit == "Celsius" and to_unit == "Fahrenheit":
        return value * 9/5 + 32
    elif from_unit == "Celsius" and to_unit == "Kelvin":
        return value + 273.15
    elif from_unit == "Fahrenheit" and to_unit == "Celsius":
        return (value - 32) * 5/9
    elif from_unit == "Fahrenheit" and to_unit == "Kelvin":
        return (value - 32) * 5/9 + 273.15
    elif from_unit == "Kelvin" and to_unit == "Celsius":
        return value - 273.15
    elif from_unit == "Kelvin" and to_unit == "Fahrenheit":
        return (value - 273.15) * 9/5 + 32
    else:
        return value  # Same unit, no conversion

def main():
    st.title("Temperature Conversion App")
    
    st.sidebar.header("Input Temperature")
    temperature = st.sidebar.number_input("Enter the temperature value:", value=0.0)
    from_unit = st.sidebar.selectbox("From unit:", ["Celsius", "Fahrenheit", "Kelvin"])
    to_unit = st.sidebar.selectbox("To unit:", ["Celsius", "Fahrenheit", "Kelvin"])
    
    if st.sidebar.button("Convert"):
        result = convert_temperature(temperature, from_unit, to_unit)
        st.success(f"{temperature} {from_unit} = {result:.2f} {to_unit}")
    
    st.sidebar.write("Developed by [Sami ullah]")

if __name__ == "__main__":
    main()