这个语法是什么意思？

Question

您好，我想知道（4）在此循环中代表什么 谢谢

# compute the percentage of the price change for every 5 days
btcusd["5d_close_pct"]=btcusd["Adj Close"].pct_change(5)

# Create a new column that shift the price (5 days change)
btcusd["5d_close_future"]=btcusd["Adj Close"].shift(-5)

# compute the percentage of the price change for every 5 days
btcusd["5d_close_future_pct"]=btcusd["5d_close_future"].pct_change()

# compute the correlation between this two columns
btcusd[btcusd["5d_close_pct"],btcusd["5d_close_future_pct"]].corr()

Answer 1

均值：从sheetXls的第8行到最后使用的行