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Add ch13 section 4 exercise 1 solution

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`1`	`1`	`# 13.4 - Rotating and Cropping PDF pages`
`2`	`2`	`# Solutions to review exercises`
	`3`	`+`
	`4`	`+# ***********`
	`5`	`+# Exercise 1`
	`6`	`+#`
	`7`	`+# In the Chapter 13 Practice Files folder there is a PDF called`
	`8`	+# `split_and_rotate.pdf`. Create a new PDF called `rotated.pdf` in your
	`9`	+# home directory containing the pages of `split_and_rotate.pdf` rotated
	`10`	`+# counter-clockwise 90 degrees.`
	`11`	`+# ***********`
	`12`	`+`
	`13`	`+frompathlibimportPath`
	`14`	`+`
	`15`	`+fromPyPDF2importPdfFileReader,PdfFileWriter`
	`16`	`+`
	`17`	`+`
	`18`	`+pdf_path=Path.home()/"github/realpython/python-basics-exercises/" \`
	`19`	`+"ch13-interact-with-pdf-files/practice_files/split_and_rotate.pdf"`
	`20`	`+`
	`21`	`+pdf_reader=PdfFileReader(str(pdf_path))`
	`22`	`+pdf_writer=PdfFileWriter()`
	`23`	`+`
	`24`	`+forpageinpdf_reader.pages:`
	`25`	`+rotated_page=page.rotateCounterClockwise(90)`
	`26`	`+pdf_writer.addPage(rotated_page)`
	`27`	`+`
	`28`	`+output_path=Path.home()/"rotated.pdf"`
	`29`	`+withoutput_path.open(mode="wb")asoutput_file:`
	`30`	`+pdf_writer.write(output_file)`

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