如何在 Python 中比较两个数据框中的列？

Question

I have a problem where I want to check if first two columns of two dataframes are identical or not ? Let say I have dataframe1 with columns ["Date","Day","Volume"] and another dataframe2 with columns ["Date","Day"] . I want to check if these two data frames are having Date and Day in the same structure or not? How can I achieve this in the most optimized way?

Answer 1

If want compare exactly same values, same index and same length between 2 columns use DataFrame.equals with subset of columns by list:

mask = df1[['Date','Day']].equals(df2[['Date','Day']])

If second df2 has only 2 columns:

mask = df1[['Date','Day']].equals(df2)