app.py

import streamlit as st

to_km_conversions = {
    'Kilometer':lambda x:x,
    "Meter": lambda x: x / 1000,
    "Centimeter": lambda x: x / 100000,
    "Millimeter": lambda x: x / 1000000,
    "Mile": lambda x: x * 1.609,
    # Add more conversions to kilometers here
}
from_km_conversions = {
    'Kilometer':lambda x:x,
    "Meter": lambda x: x * 1000,
    "Centimeter": lambda x: x * 100000,
    "Millimeter": lambda x: x * 1000000,
    "Mile": lambda x: x / 1.609,
    # Add more conversions from kilometers here
}

from_second={
    'Second': lambda x: x,
    'Minute': lambda x: x / 60,
    'Hour': lambda x: x / 3600,
    # Add more conversions to seconds here
}

to_second={
    'Second': lambda x: x,
    'Minute': lambda x: x * 60,
    'Hour': lambda x: x * 3600,
    # Add more conversions to seconds here
}

to_kg={
    'Kilogram': lambda x: x,
    'Gram': lambda x: x / 1000,
    'Milligram': lambda x: x / 1000000,
    # Add more conversions to kilograms here
}

from_kg={
    'Kilogram': lambda x: x,
    'Gram': lambda x: x * 1000,
    'Milligram': lambda x: x * 1000000,
    # Add more conversions to kilograms here
}

Length = [to_km_conversions,from_km_conversions]

Time=[to_second,from_second]

Mass=[to_kg,from_kg]

def convert_units(value, from_unit, to_unit, unit_type):
    conversions = globals()[unit_type]

    # if from_unit not in conversions or to_unit not in conversions[from_unit]:
        # return "Invalid unit conversion"

    if from_unit != to_unit:
        a = conversions[0][from_unit](value)
        result=conversions[1][to_unit](a)
        result=round(result,8)
    else:
        result = value

    return result

def app():
    st.title("Unit Converter")

    # Get user input
    value = st.number_input("Enter a value", value=1.0, step=1.0)
    unit_type = st.selectbox("Unit type", ["Length", "Time", "Mass"])
    from_unit = st.selectbox("From unit",list(globals()[unit_type][0].keys()))
    to_unit=st.selectbox("To unit",list(globals()[unit_type][1].keys()))

    # Perform conversion
    result = convert_units(value, from_unit, to_unit, unit_type)

    # Display the result
    st.write(f"{value} {from_unit} is equal to {result} {to_unit}")

if __name__ == "__main__":
    app()