pre_sale = pd.read_csv('C:/Users/user/DataAnal/apt_price/전국_평균_분양가격2018.7월.csv', encoding='euc-kr')
=> OSError: Initializing from file failed
해결책
pre_sale = pd.read_csv('C:/Users/user/DataAnal/apt_price/전국_평균_분양가격2018.7월.csv',engine='python', encoding='euc-kr')
