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Move rotating and cropping solutions to a new file

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	`1`	`+# 13.2 - Extract Pages From a PDF`
	`2`	`+# Solutions to review exercises`
	`3`	`+`
	`4`	`+importos`
	`5`	`+importcopy`
	`6`	`+frompyPDF2importPdfFileReader,PdfFileWriter`
	`7`	`+`
	`8`	`+`
	`9`	`+# Exercise 1`
	`10`	`+path="C:/python-basics-exercises/ch13-interact-with-pdf-files/\`
	`11`	`+ practice_files"`
	`12`	`+`
	`13`	`+input_file_path=os.path.join(path,"Walrus.pdf")`
	`14`	`+input_file=PdfFileReader(input_file_path)`
	`15`	`+output_PDF=PdfFileWriter()`
	`16`	`+`
	`17`	`+input_file.decrypt("IamtheWalrus")# decrypt the input file`
	`18`	`+`
	`19`	`+`
	`20`	`+# Exercise 2`
	`21`	`+forpage_numinrange(0,input_file.getNumPages()):`
	`22`	`+# rotate pages (call everything page_left for now; will make a copy)`
	`23`	`+page_left=input_file.getPage(page_num)`
	`24`	`+page_left.rotateCounterClockwise(90)`
	`25`	`+`
	`26`	`+page_right=copy.copy(page_left)# split each page in half`
	`27`	`+upper_right=page_left.mediaBox.upperRight# get original page corner`
	`28`	`+`
	`29`	`+# crop and add left-side page`
	`30`	`+page_left.mediaBox.upperRight= (upper_right[0]/2,upper_right[1])`
	`31`	`+output_PDF.addPage(page_left)`
	`32`	`+# crop and add right-side page`
	`33`	`+page_right.mediaBox.upperLeft= (upper_right[0]/2,upper_right[1])`
	`34`	`+output_PDF.addPage(page_right)`
	`35`	`+`
	`36`	`+`
	`37`	`+# Exercise 3`
	`38`	`+# save new pages to an output file`
	`39`	`+output_file_path=os.path.join(path,"Output/Updated Walrus.pdf")`
	`40`	`+withopen(output_file_path,"wb")asoutput_file:`
	`41`	`+output_PDF.write(output_file)`

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