Pandas - 有效地从列表中搜索数据帧列

I am trying to figure out the most efficient way to search a data frame in Pandas with a list (dataframe) of other values without using brute force methods. Is there a way to vectorize it? I know I can for loop each element of the list (or dataframe) and extract the data using the loc method, but was hoping for something faster. I have a data frame with 1 million rows and I need to search within it to extract the index of 600,000 rows.I am trying to figure out the most efficient wa