Learn how to use the dir() function to return the list of the attributes and methods of the object.

Learn how to check if a code-point is a unicode surrogate pair.

Port BindExceptions can occur if a port is already occupied by some other process and you try to use it again. See an example of how it works and the mechanisms involved.

Learn how to pass parameters to an SQL query written with @Query via @Param or positional parameters.

See how to use the Object Explorer feature in SQL to find a particular stored procedure from a long list of available options.

See how to use the int() type constructor to convert a string to number.

See an example of how class annotations can be inspected via reflection.

MySQL provides a mechanism to alter the user properties, thereby allowing you to lock the user account.

Learn how to call a private constructor from outside its class.

When dealing with large lists of information, we, as developers, sometimes need to copy them, then add commas manually. See a neat trick to automatically add the required commas.