Code Editor for app.py

import streamlit as st
import pandas as pd
import plotly.express as px

# Set page config
st.set_page_config(page_title="Population Density", layout="wide")

# Title
st.title("Population Density")

# Load sample world population data
@st.cache_data
def load_data():
    # Create sample data for demonstration
    df = pd.DataFrame({
        'country': ['China', 'India', 'USA', 'Indonesia', 'Pakistan'],
        'population_density': [153, 464, 36, 151, 287]
    })
    return df

data = load_data()

# Create choropleth map
fig = px.choropleth(
    data,
    locations='country',
    locationmode='country names',
    color='population_density',
    hover_name='country',
    color_continuous_scale='Viridis',
    title='World Map',
    height=600
)

# Update layout
fig.update_layout(
    margin=dict(l=0, r=0, t=30, b=0),
    coloraxis_colorbar_title='Population Density<br>(people per km²)'
)

# Display the map
st.plotly_chart(fig, use_container_width=True)