I understand that pandas is designed to load fully populated DataFrame but I need to create an empty DataFrame then add rows, one by one . What is the best way to do this ? ...

What is a good example of a cross-cutting concern ? The medical record example on the wikipedia page seems incomplete to me. ...

As far as I know, foreign keys (FK) are used to aid the programmer to manipulate data in the correct way. Suppose a programmer is actually doing this in the right manner already, then do we really need the concept of foreign keys? ...

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I've got a table that collects forms submitted from our website, but for some reason, when they created the table, they didn't put a timestamp in the table. I want it to enter the exact date and time that the record was entered. ...

I started using git sometime back and do not fully understand the intricacies. My basic question here is to find out the difference between a git pull and git pull --rebase , since adding the --rebase option does not seem to do something very different : just does a pull. ...

I have written a code in python which uses / to make a particular file in a folder, if I want to use the code in windows it will not work, is there a way by which I can use the code in Windows and Linux. ...

I have a dialog with EditText for input. When I click the "yes" button on dialog, it will validate the input and then close the dialog. However, if the input is wrong, I want to remain in the same dialog. Every time no matter what the input is, the dialog should be automatically closed when I clic...

A common problem that new Java developers experience is that their programs fail to run with the error message: Could not find or load main class ... ...

I'm trying to install a gem using gem install mygem or update RubyGems using gem update --system , and it fails with this error: ...