app.py

import streamlit as st

def celsius_to_fahrenheit(c):
    return (c * 9/5) + 32

def celsius_to_kelvin(c):
    return c + 273.15

def fahrenheit_to_celsius(f):
    return (f - 32) * 5/9

def fahrenheit_to_kelvin(f):
    return (f - 32) * 5/9 + 273.15

def kelvin_to_celsius(k):
    return k - 273.15

def kelvin_to_fahrenheit(k):
    return (k - 273.15) * 9/5 + 32

# App title
st.title("Temperature Converter")

# Input section
st.sidebar.header("Input")
input_value = st.sidebar.number_input("Enter the temperature value:", value=0.0, format="%.2f")
input_unit = st.sidebar.selectbox("Select the input unit:", ["Celsius", "Fahrenheit", "Kelvin"])
output_unit = st.sidebar.selectbox("Select the output unit:", ["Celsius", "Fahrenheit", "Kelvin"])

# Conversion logic
converted_value = None
if input_unit == output_unit:
    converted_value = input_value
else:
    if input_unit == "Celsius":
        if output_unit == "Fahrenheit":
            converted_value = celsius_to_fahrenheit(input_value)
        elif output_unit == "Kelvin":
            converted_value = celsius_to_kelvin(input_value)
    elif input_unit == "Fahrenheit":
        if output_unit == "Celsius":
            converted_value = fahrenheit_to_celsius(input_value)
        elif output_unit == "Kelvin":
            converted_value = fahrenheit_to_kelvin(input_value)
    elif input_unit == "Kelvin":
        if output_unit == "Celsius":
            converted_value = kelvin_to_celsius(input_value)
        elif output_unit == "Fahrenheit":
            converted_value = kelvin_to_fahrenheit(input_value)

# Output section
if converted_value is not None:
    st.write(f"**Converted Value:** {converted_value:.2f} {output_unit}")
else:
    st.write("Unable to convert the temperature.")

st.sidebar.write("\n\n**Tip:** Select different units to see the conversion.")