I have a pandas DataFrame like following: df = pd.DataFrame({‘id’ : [1,1,1,2,2,3,3,3,3,4,4,5,6,6,6,7,7], ‘value’ : [“first”,”second”,”second”,”first”, “second”,”first”,”third”,”fourth”, “fifth”,”second”,”fifth”,”first”, “first”,”second”,”third”,”fourth”,”fifth”]}) I want to group this by [“id”,”value”] and get the first row of each group: id value 0 1 first 1 1 second 2 1 second 3 2 first 4 2 second 5 3 first 6 3 … Read more
How can I find the row for which the value of a specific column is maximal? df.max() will give me the maximal value for each column, I don’t know how to get the corresponding row. 13 Answers 13
I’ve got a very large MySQL table with about 150,000 rows of data. Currently, when I try and run SELECT * FROM table WHERE id = ‘1’; the code runs fine as the ID field is the primary index. However, for a recent development in the project, I have to search the database by another … Read more
How do I count the number of tr elements within a table using jQuery? I know there is a similar question, but I just want the total rows. 12 s 12 Use a selector that will select all the rows and take the length. var rowCount = $(‘#myTable tr’).length; Note: this approach also counts all … Read more