app.py

import streamlit as st

# Title of the app
st.title('Temperature Converter')

# Instructions
st.write("Convert temperature between Celsius, Fahrenheit, and Kelvin.")

# Input field for temperature value
temp_input = st.number_input("Enter temperature value:", value=0.0)

# Dropdown menu to select the input unit
input_unit = st.selectbox("Select input unit:", ["Celsius", "Fahrenheit", "Kelvin"])

# Dropdown menu to select the output unit
output_unit = st.selectbox("Select output unit:", ["Celsius", "Fahrenheit", "Kelvin"])

# Conversion functions
def celsius_to_fahrenheit(celsius):
    return (celsius * 9/5) + 32

def celsius_to_kelvin(celsius):
    return celsius + 273.15

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

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

def kelvin_to_celsius(kelvin):
    return kelvin - 273.15

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

# Conversion logic
if input_unit == "Celsius":
    if output_unit == "Fahrenheit":
        result = celsius_to_fahrenheit(temp_input)
    elif output_unit == "Kelvin":
        result = celsius_to_kelvin(temp_input)
    else:
        result = temp_input  # Same unit

elif input_unit == "Fahrenheit":
    if output_unit == "Celsius":
        result = fahrenheit_to_celsius(temp_input)
    elif output_unit == "Kelvin":
        result = fahrenheit_to_kelvin(temp_input)
    else:
        result = temp_input  # Same unit

elif input_unit == "Kelvin":
    if output_unit == "Celsius":
        result = kelvin_to_celsius(temp_input)
    elif output_unit == "Fahrenheit":
        result = kelvin_to_fahrenheit(temp_input)
    else:
        result = temp_input  # Same unit

# Display result
st.write(f"Converted temperature: {result:.2f} {output_unit}")