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Add ch13 section 5 exercise 1 solution

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	`1`	`+# 13.5 - Encrypting and Decrypting PDFs`
	`2`	`+# Solutions to review exercises`
	`3`	`+`
	`4`	`+# ***********`
	`5`	`+# Exercise 1`
	`6`	`+#`
	`7`	`+# In the Chapter 13 Practice Files folder there is a PDF file called`
	`8`	+# `top_secret.pdf`. Encrypt the file with the user password
	`9`	+# `Unguessable`. Save the encrypted file as in your home directory as
	`10`	+# `top_secret_encrypted.pdf`.
	`11`	`+# ***********`
	`12`	`+`
	`13`	`+frompathlibimportPath`
	`14`	`+`
	`15`	`+fromPyPDF2importPdfFileReader,PdfFileWriter`
	`16`	`+`
	`17`	`+`
	`18`	`+pdf_path=Path.home()/"python-basics-exercises/" \`
	`19`	`+"ch13-interact-with-pdf-files/practice_files/top_secret.pdf"`
	`20`	`+`
	`21`	`+pdf_reader=PdfFileReader(str(pdf_path))`
	`22`	`+pdf_writer=PdfFileWriter()`
	`23`	`+`
	`24`	`+pdf_writer.appendPagesFromReader(pdf_reader)`
	`25`	`+pdf_writer.encrypt(user_pwd="Unguessable")`
	`26`	`+`
	`27`	`+output_path=Path.home()/"top_secret_encrypted.pdf"`
	`28`	`+withoutput_path.open(mode="wb")asoutput_file:`
	`29`	`+pdf_writer.write(output_file)`

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