Create a Python class, Document.Using PYTHON: The instances of this class have the following attributes: word_count, status, grade, asked_grade_before_submission_count and the following methods: add_words, submit,get_grade,_str_. For this exercise, we will add the following attribute/s:(1) key - a class attribute that determines the output when printing the document instance. It has a value of 0 by default.Let us also add these additional method/s for the Document class:(1) copy_content - takes in source_document as a parameter of type Document then updates the word_count of the destination document (or the document where this method was invoked). Theword_count is updated accordingly so that the content of the destination document is replaced by the source document.(2) append_content - takes in source_document as a parameter of type Document then updates the word_count of the destination document. The word_count is updated such that the content ofthe source document is appended to the destination document.Input FormatThe inputs are commands that can access an attribute or invoke a method of a Document instance. These commands can either be valid or invalid.ConstraintsString arguments when creating a Document instance and when invoking the add_words method will be limited to 1000 characters at maximum. Only alphanumeric characters will be used as anargument to these methods.The invalid commands only include those that are trying to access an attribute of the object that is undefined.Output FormatThe output will be composed of 5 - 6 lines. The first five lines show the stats of the document being printed. The other is either an empty string or a string that shows one out of many descriptionsof the Document instance being printed.Sample Input 0essayclasses ['essay'] = essayessay_draftDocument ("Violets are blue")classes ['essay_draft'] = essay_draftessay.append_content (essay_draft)essay.key = 0exitSample Output 0Valid commandValid commandValid commandValid commandValid commandDocument ("Roses are red")Valid commandThis Document instance has the following stats.1. word count: 62. status: draft3. grade: awaiting submission4. number of times the grade was requested before the document was submitted: 0Sample Input 1essay Document ("Roses are red").classes ['essay'] = essayessay_draftclasses ['essay_draft'] = essay_draftexitessay.append_content (essay_draft)another essay_v2 = Document ("Go away Anna! Okay bye.")essay.copy_content (another_essay_v2)essay.key=0Document ("Violets are blue")Sample Output 1Valid commandValid commandValid commandValid commandValid commandValid commandValid commandValid commandThis Document instance has the following stats.1. word count: 52. status: draft3. grade: awaiting submission4. number of times the grade was requested before the document was submitted: 0Sample Input 2essay Document ("Roses are red")classes ['essay'] = essayessay_draftclasses ['essay_draft'] = essay_draftDocument ("Violets are blue")essay.append_content (essay_draft)essay.add_words ("Sugar is sweet and so are you")essay.key_1essay.delete()essay.key = 0exitSample Output 2Valid command.Valid commandValid commandValid commandValid commandValid commandInvalid commandInvalid commandValid commandThis Document instance has the following stats.1. word count: 13.2. status: draft3. grade: awaiting submission4. number of times the grade was requested before the document was submitted: 0Sample Input 3Document ("Roses are red").essayclasses ['essay'] = essayessay_draft Document ("Violets are blue").classes ['essay_draft'] = essay_draftessay.append_content (essay_draft).append_content (essay_draft)essay.add_words ("Sugar is sweet and so are you")essay.key_1essay.delete()essay.key=0exitSample Output 3Valid commandValid commandValid commandValid commandValid commandValid commandInvalid commandInvalid commandValid commandThis Document instance has the following stats.1. word count: 162. status: draft3. grade: awaiting submission4. number of times the grade was requested before the document was submitted: 0

Question

Create a Python class, Document.Using PYTHON: The instances of this class have the following attributes: word_count, status, grade, asked_grade_before_submission_count and the following methods: add_words, submit,get_grade,_str_. For this exercise, we will add the following attribute/s:(1) key - a class attribute that determines the output when printing the document instance. It has a value of 0 by default.Let us also add these additional method/s for the Document class:(1) copy_content - takes in source_document as a parameter of type Document then updates the word_count of the destination document (or the document where this method was invoked). Theword_count is updated accordingly so that the content of the destination document is replaced by the source document.(2) append_content - takes in source_document as a parameter of type Document then updates the word_count of the destination document. The word_count is updated such that the content ofthe source document is appended to the destination document.Input FormatThe inputs are commands that can access an attribute or invoke a method of a Document instance. These commands can either be valid or invalid.ConstraintsString arguments when creating a Document instance and when invoking the add_words method will be limited to 1000 characters at maximum. Only alphanumeric characters will be used as anargument to these methods.The invalid commands only include those that are trying to access an attribute of the object that is undefined.Output FormatThe output will be composed of 5 - 6 lines. The first five lines show the stats of the document being printed. The other is either an empty string or a string that shows one out of many descriptionsof the Document instance being printed.Sample Input 0essayclasses ['essay'] = essayessay_draftDocument (&#34;Violets are blue&#34;)classes ['essay_draft'] = essay_draftessay.append_content (essay_draft)essay.key = 0exitSample Output 0Valid commandValid commandValid commandValid commandValid commandDocument (&#34;Roses are red&#34;)Valid commandThis Document instance has the following stats.1. word count: 62. status: draft3. grade: awaiting submission4. number of times the grade was requested before the document was submitted: 0Sample Input 1essay Document (&#34;Roses are red&#34;).classes ['essay'] = essayessay_draftclasses ['essay_draft'] = essay_draftexitessay.append_content (essay_draft)another essay_v2 = Document (&#34;Go away Anna! Okay bye.&#34;)essay.copy_content (another_essay_v2)essay.key=0Document (&#34;Violets are blue&#34;)Sample Output 1Valid commandValid commandValid commandValid commandValid commandValid commandValid commandValid commandThis Document instance has the following stats.1. word count: 52. status: draft3. grade: awaiting submission4. number of times the grade was requested before the document was submitted: 0Sample Input 2essay Document (&#34;Roses are red&#34;)classes ['essay'] = essayessay_draftclasses ['essay_draft'] = essay_draftDocument (&#34;Violets are blue&#34;)essay.append_content (essay_draft)essay.add_words (&#34;Sugar is sweet and so are you&#34;)essay.key_1essay.delete()essay.key = 0exitSample Output 2Valid command.Valid commandValid commandValid commandValid commandValid commandInvalid commandInvalid commandValid commandThis Document instance has the following stats.1. word count: 13.2. status: draft3. grade: awaiting submission4. number of times the grade was requested before the document was submitted: 0Sample Input 3Document (&#34;Roses are red&#34;).essayclasses ['essay'] = essayessay_draft Document (&#34;Violets are blue&#34;).classes ['essay_draft'] = essay_draftessay.append_content (essay_draft).append_content (essay_draft)essay.add_words (&#34;Sugar is sweet and so are you&#34;)essay.key_1essay.delete()essay.key=0exitSample Output 3Valid commandValid commandValid commandValid commandValid commandValid commandInvalid commandInvalid commandValid commandThis Document instance has the following stats.1. word count: 162. status: draft3. grade: awaiting submission4. number of times the grade was requested before the document was submitted: 0

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