将下列r代码改成python代码： resid <- list() for (i in 1:ncol(returns)) { resid[[i]] <- residuals(garchFit(~garch(1,1), data=as.numeric(returns[,i]), trace=FALSE, cond.dist="sstd"), standardize=TRUE) }

下面是将R代码改写成Python代码的示例：

import pandas as pd
from arch import arch_model

returns = pd.read_csv("path/to/returns.csv")
resid = []

for i in range(returns.shape[1]):
    garch = arch_model(returns.iloc[:, i], mean="Zero", vol="GARCH", p=1, q=1, dist="Normal")
    res = garch.fit(disp="off").resid
    resid.append(res)

print(resid)

注意，上述代码需要安装 arch 包。