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# µû¶óÇÏ¸ç ¹è¿ì´Â ÆÄÀ̽ã°ú µ¥ÀÌÅͰúÇÐ(»ý´ÉÃâÆÇ»ç 2020)
# 12.12 »õ·Î¿î ¿À» ½±°Ô »ý¼ºÇØ º¸ÀÚ, 319ÂÊ
#
import pandas as pd
import matplotlib.pyplot as plt
countries_df = pd.read_csv('d:/data/countries.csv', index_col = 0)
countries_df['density'] = countries_df['population'] / countries_df['area']
print(countries_df)