How can you denote a single-line comment in Python?

In Python, a single-line comment is denoted by using the hash symbol (#). When the interpreter encounters this symbol in the code, it ignores everything that follows it on that line. This allows developers to include comments within their code to explain or annotate what the code is doing, making it easier for others (or themselves at a later time) to understand the logic and purpose of the code without affecting its execution.

The other methods listed are used in different programming languages: the /* comment */ syntax is used for multi-line comments in languages like C and Java, while // comment is used for single-line comments in languages like C++, Java, and JavaScript. The -- comment syntax is used in SQL for comments. Therefore, in the context of Python, using # is the standard and correct way to introduce a single-line comment.