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Remove old exercise solutions

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ch13-interact-with-pdf-files
- 4-rotating-and-cropping-pdf-pages.py

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`‎ch13-interact-with-pdf-files/4-rotating-and-cropping-pdf-pages.py`

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Original file line number	Diff line number	Diff line change
`@@ -1,41 +1,2 @@`
`1`		`-# 13.2 -Extract Pages From aPDF`
	`1`	`+# 13.4 -Rotating and CroppingPDF pages`
`2`	`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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`‎ch13-interact-with-pdf-files/4-rotating-and-cropping-pdf-pages.py`

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