fig, ax = plt.subplots(figsize=(10,8))
sc = ax.scatter(ns_book8['발행년도'], ns_book8['출판사'],
linewidths=0.5, edgecolors='k', alpha=0.3,
s=ns_book8['대출건수']**1.3, c=ns_book8['대출건수'], cmap='jet')
ax.set_title('출판사별 발행 도서')
fig.colorbar(sc)
fig.show()