Call the ax.bar method to plot the "Gold" column as a function of the country. Use the ax.set_xticklabels to set the x-a

下面是完整代码： ```python fig, ax = plt.subplots() # Plot a bar-chart of gold medals as a function of country ax.bar(medals.index, medals["Gold"]) # Set the x-axis tick labels to the country names and rotate them by 90 degrees ax.set_xticklabels(medals.index, rotation=90) # Set the y-axis label ax.set_ylabel("Number of medals") plt.show() ```