สร้าง Choropleth ด้วย Geopandas แบบสมบูรณ์

# Merge permits_by_district and counts_df
districts_and_permits = pd.merge(____, ____, on = ____)

# Create permit_density column
districts_and_permits['permit_density'] = districts_and_permits.apply(lambda row: row.____ / row.____, axis = 1)
print(districts_and_permits.head(2))

# Create choropleth plot
districts_and_permits.plot(column = ____, ____ = 'OrRd', ____ = 'black', legend = True)

# Add axis labels and title
plt.xlabel(____)
plt.ylabel(____)
plt.title('2017 Building Project Density by Council District')
plt.show()