virtus | Attributes on Steroids for Plain Old Ruby

You can read the file with pandas.read_csv() with error_bad_lines=False:

If I understand correctly, you are trying to capture only one # symbol at the beginning of each line.

The regular expression that helps you solve the issue is: r"(?:^|\s)(?:[#]\ )(.*\n+##\ ([^#]*\n)+)". The brackets isolate the capturing or non capturing groups. The first group (?:^|\s) is a non capturing group, because it starts with a question mark. Here you want that your matched string starts with the beginning of a line or a whitespace, then in the second group ([#]\ ), [#] will match exactly one # character. \ matches the space between the hash and the h1 tag text content. finally you want to match any possible character until the end of the line so you use the special characther ., which identifies any character, followed by + that will match any repetition of the previous matched character.

This is probably the code snippet you are looking for, I tested it with the same sample test you used.

I think there are two issues here.

Bundler is not installed (or the wrong version is installed)

Whatever system is running the tests / linter (appears to be Github's CI tool) doesn't have the correct version of bundler installed. Try adding

Please add stdin_open: true to the docker-compose file.

def books=(books) is defining a method called books= which takes a single argument books. Yes, that's confusing. It should probably be def books=(value) or def books=(new_books).

And yes, the = is part of the method name. self.books = value is really syntax sugar for self.books=(value). Again, the method is books=.

super books is super(books). super calls the next inherited or included method of the same name; it's calling books= created by attribute :books, Array[Book]. This is a "method override" which allows you to add to the behavior of an existing method.

When books= is called it updates latest_books and then calls its the original method to set the books attribute.

as suggested in one of the comments, checking