Exception handling
shape
**IActionResult** is an interface in ASP.NET MVC (and also in ASP.NET Core MVC) that represents the result of an action method. In MVC (Model-View-Controller) applications, an action method in a controller returns an instance of IActionResult, which is used to define the response that will be sent back to the client (typically a web browser). open() function. unittest framework. Python's unittest is based on the xUnit pattern, which is widely adopted in other languages and frameworks (e.g., JUnit in Java, NUnit in C#). It provides a structured way to write and organize tests. open() function is used to open a file and return a file object, which can then be used to read, write, or manipulate the contents of the file. The open() function allows you to specify different file access modes to control how the file is opened. yield keyword is used to define a generator. A generator is a special type of iterator that allows you to iterate over a sequence of values, but unlike a regular function that returns a single value, a generator function can yield multiple values, one at a time. It provides a way to generate values on the fly, which makes it particularly useful for working with large datasets or streams of data where you don't want to hold all the values in memory at once.