Which of the following is a popular interpreted programming language?

Python is a widely used interpreted programming language known for its readability and simplicity. One of its defining features is that Python code is executed line by line, which allows for a dynamic and interactive programming experience. This characteristic makes Python particularly suitable for scripting, rapid prototyping, and data analysis, as developers can test their code in real-time without the need for compilation.

Interpreted languages like Python are often favored for applications requiring quick development cycles or when developers need to interactively explore data and prototypes. Python's extensive libraries and frameworks further enhance its versatility, catering to various domains such as web development, data science, machine learning, automation, and more.

In contrast, the other languages listed—C#, Swift, and C++—are primarily compiled languages. They generally require a compilation step before execution, which can lead to more complex development processes and longer build times. While they have their own advantages in performance and system-level programming, they do not match Python's stimulating ease of use and rapid execution times in an interpreted environment.