Hello sir: How can I sort a dataframe by sorting one of its column? e.g. dataframe: id x y a 0.1 3 b 0.5 1 c 0.2 9 d 0 5 I want the dataframe sorted according to y accending,the result is: id x y b 0.5 1 a 0.1 3 d 0 5 c 0.2 9 Thanks a lot! My best