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In a Dockerfile, you can add comments to provide information about the Dockerfile and the instructions in it. Comments in Dockerfiles start with the # symbol and continue to the end of the line.

Press Ctrl + / on Windows or Command + / on Mac to toggle line comments. Alternatively, you can press Shift + Alt + A to toggle block comments. Now that you have an understanding of how to comment out multiple lines in VS Code, you can go ahead and use it in your Python program.

In YAML, the # symbol is used for both inline and multiline comments. Happy coding!

How to comment YAML? YAML comments start with a hash sign (#) and can be placed anywhere in the file, except inside strings or scalars. They can be either single-line or multi-line, depending on preference and the length of the comment.

Comments​ Adding comments to blocks of YAML can really help the reader understand the example better. The indentation level of the comment must match the current indentation level. Preferably the comment is written above the line the comment applies to, otherwise lines may become hard to read on smaller displays.

How to comment YAML? YAML comments start with a hash sign (#) and can be placed anywhere in the file, except inside strings or scalars. They can be either single-line or multi-line, depending on preference and the length of the comment.

YAML does not support block or multi-line comments. In order to create a multi-line comment, we need to add # at the beginning of each line.

In order to add comments to a YAML file, you simply have to use the # (hashtag symbol) at the start of the line.