Add the x-axis value captions to the code of this graph and change its color to purple gdpdiff[['Country or region', 'GDP per capita']].plot(kind='bar')

gdpdiff[['Country or region', 'GDP per capita']].plot(kind='bar')
plt.xlabel('Country or region')
plt.ylabel('GDP per capita')
plt.title('Change in GDP per capita')
plt.show()