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Get local IP address

... internet there are several places that show you how to get an IP address. And a lot of them look like this example: 25 Ans...
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What is the difference between a cer, pvk, and pfx file?

What is the difference between a cer, pvk, and pfx file? Also, which files do I keep and which am I expected to give to my counter-parties? ...
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Adding new column to existing DataFrame in Python pandas

I have the following indexed DataFrame with named columns and rows not- continuous numbers: 24 Answers ...
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How can I prevent SQL injection in PHP?

... Use prepared statements and parameterized queries. These are SQL statements that are sent to and parsed by the database server separately from any parameters. This way it is impossible for an attacker to inject malicious SQL. You basically have two...
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How to search through all Git and Mercurial commits in the repository for a certain string?

I have a Git repository with few branches and dangling commits. I would like to search all such commits in repository for a specific string. ...
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Python argparse: default value or specified value

...ngs? I have a dilemma with differentiation of "" (empty string as default) and "" (empty string as entered by user). In the code for now I'm using the default and since I need to do some ops, I have something like this self.foo = (args.bar or some_else_source).upper(). It will break on None object A...
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In Java, when should I create a checked exception, and when should it be a runtime exception? [dupli

When should I create a checked exception, and when should I make a runtime exception? 14 Answers ...
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Increment value in mysql update query

...uery has the following note: This extension is deprecated as of PHP 5.5.0, and will be removed in the future. Instead, the MySQLi or PDO_MySQL extension should be used. See also MySQL: choosing an API guide and related FAQ for more information. – aland Mar 24 '...
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How do I get the current time zone of MySQL?

... From the manual (section 9.6): The current values of the global and client-specific time zones can be retrieved like this: mysql> SELECT @@global.time_zone, @@session.time_zone; Edit The above returns SYSTEM if MySQL is set to slave to the system's timezone, which is less than help...
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Invalidating JSON Web Tokens

... I too have been researching this question, and while none of the ideas below are complete solutions, they might help others rule out ideas, or provide further ones. 1) Simply remove the token from the client Obviously this does nothing for server side security, but it...