The key is to make your file a Python file and then things (comments included) will “stand out”, example:
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See where it says “Python file” on the status bar?
You can make this appear by saving your file with a name that ends in .py, or by choosing “Python” on the Language menu.
Also, a Python comment involves no “bracketing”. A # appearing on a line will cause anything following that character (and still on that same line) to be a comment.