sing PYTHON: The instances of this class have the following attributes: word_count, status, grade, asked_grade_before_submission_count and the followin et_grade, str. For this exercise, we will add the following attribute/s: ) key - a class attribute that determines the output when printing the document instance. It has a value of 0 by default. et us also add these additional method/s for the Document class: ) copy_content - takes in source_document as a parameter of type Document then updates the word_count of the destination document (or the document wh ord_count is updated accordingly so that the content of the destination document is replaced by the source document. ) append_content - takes in source document as a parameter of type Document then updates the word_count of the destination document. The word_count e source document is appended to the destination document. put Format he inputs are commands that can access an attribute or invoke a method of a Document instance. These commands can either be valid or invalid.

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