如何在相关矩阵中循环以仅给出高于某个阈值的相关对？和/或提高效率

I've got the following code:

我有以下代码:

for i in list(corr.columns):
    for j in list(corr.columns):
        if corr.ix[i,j]>0.7 and corr.ix[i,j] != 1:
            print i, ' ',j ,' ', corr.ix[i,j] 
for i