How to fix ‘Notice: Undefined index:’ in PHP form action

Assuming you only copy/pasted the relevant code and your form includes <form method=”POST”> If _POST is not set the filename variable won’t be either in the above example. An alternative way: In this example filename is set regardless of the situation with _POST. This should demonstrate the use of isset nicely. More information here: http://php.net/manual/en/function.isset.php

What is the best project structure for a Python application?

Doesn’t too much matter. Whatever makes you happy will work. There aren’t a lot of silly rules because Python projects can be simple. /scripts or /bin for that kind of command-line interface stuff /tests for your tests /lib for your C-language libraries /doc for most documentation /apidoc for the Epydoc-generated API docs. And the top-level directory can contain README’s, Config’s and whatnot. … Read more

Link with target=”_blank” and rel=”noopener noreferrer” still vulnerable?

You may be misunderstanding the vulnerability. You can read more about it here: https://www.jitbit.com/alexblog/256-targetblank—the-most-underestimated-vulnerability-ever/ Essentially, adding rel=”noopener noreferrer” to links protects your site’s users against having the site you’ve linked to potentially hijacking the browser (via rogue JS). You’re asking about removing that attribute via Developer Tools – that would only potentially expose you (the person tampering with the attribute) to the … Read more

Print a list in reverse order with range()?

use reversed() function: It’s much more meaningful. Update: If you want it to be a list (as btk pointed out): Update: If you want to use only range to achieve the same result, you can use all its parameters. range(start, stop, step) For example, to generate a list [5,4,3,2,1,0], you can use the following: It may be less intuitive but as … Read more

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