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http://funyakofunyao.click/2019/04/15/tidyquant%e3%81%a7%e6%97%a5%e7%b5%8c%e5%b9%b3%e5%9d%87%e6%a0%aa%e4%be%a1%e3%82%92%e5%8f%96%e5%be%97%e3%81%99%e3%82%8b/
tidyquantで日経平均株価を取得する