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Commit3024506

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Update Ch 17 exercise solutions
1 parent8002ec9 commit3024506

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# 17.1 - Add GUI Elements with EasyGUI
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# Review Exercises
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importeasyguiasgui
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# Exercise #1
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gui.msgbox(msg="Warning!",title="Watch out!",ok_button="I'll be careful")
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# Exercise #2
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gui.enterbox(msg="What is your name?")

‎ch17-graphical-user-interfaces/6-challenge-return-of-the-poet.pyrenamed to‎ch17-graphical-user-interfaces/10-challenge-return-of-the-poet.py

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# 17.6 - Challenge: Return of the Poet
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# 17.10 - Challenge: Return of the Poet
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# Solution to challenge
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# Please note that there are many ways to solve this challenge. The code

‎ch17-graphical-user-interfaces/1-add-gui-elements-with-easy-gui.pyrenamed to‎ch17-graphical-user-interfaces/2-example-app-pdf-page-rotator.py

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# 17.1 - Add GUI Elements With EasyGUI
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# Review Exercise #4
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# NOTE: The first three exercises in this section are instructional
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# and do not require solutions to be shown here. For this reason,
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# only the solution to the fourth exercise is presented.
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# 17.2 - Example App: PDF Page Rotator
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# Review Exercise #1
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importeasyguiasgui
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fromPyPDF2importPdfFileReader,PdfFileWriter

‎ch17-graphical-user-interfaces/2-challenge-use-gui-elements-to-help-a-user-modify-files.pyrenamed to‎ch17-graphical-user-interfaces/3-challenge-use-gui-elements-to-help-a-user-modify-files.py

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# 17.2 - Challenge: Use GUI Elements to Help a User Modify Files
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# 17.3 - Challenge: Use GUI Elements to Help a User Modify Files
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# Solution to challenge
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# save part of a PDF based on a user-supplied page range using a GUI
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importeasyguiasgui
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fromPyPDF2importPdfFileReader,PdfFileWriter
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#letthe userchoose an inputfile
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#1. Askthe userto select a PDFfile to open.
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input_file_path=gui.fileopenbox("","Select a PDF to trim...","*.pdf")
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ifinput_file_pathisNone:# exit on "Cancel"
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exit()
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#get the page length of the input file
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input_file=PdfFileReader(input_file_path)
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total_pages=input_file.getNumPages()
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#2. If no PDF file is chosen, exit the program.
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ifinput_file_pathisNone:
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exit()
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#let the user choose a beginning page
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#3. Ask for a starting page number.
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page_start=gui.enterbox(
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"Enter the number of the first page to use:","Where to begin?"
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)
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ifpage_startisNone:# exit on "Cancel"
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# 4. If the user does not enter a starting page number, exit the program.
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ifpage_startisNone:
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exit()
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# check for possible problems and try again:
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# 1) input page number isn't a (non-negative) digit
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# or 2) input page number is 0
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# or 3) page number is greater than total number of pages
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# 5. Valid page numbers are positive integers. If the user enters an invalid page number:
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# - Warn the user that the entry is invalid
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# - Return to step 3.
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# This solution also checks that the starting page number is not beyond the last page of the PDF!# 3. Asl for a starting page number.
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input_file=PdfFileReader(input_file_path)# Open the PDF
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total_pages=input_file.getNumPages()# Get the total number of pages
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while (
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notpage_start.isdigit()
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orpage_start=="0"
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ifpage_startisNone:# exit on "Cancel"
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exit()
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#let the user choosean ending page
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#6. Ask foran ending page number
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page_end=gui.enterbox(
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"Enter the number of the last page to use:","Where to end?"
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)
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# 7. If the user does not enter and ending page number, exit the program.
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ifpage_endisNone:# exit on "Cancel"
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exit()
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# check for possible problems and try again:
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# 1) input page number isn't a (non-negative) digit
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# or 2) input page number is 0
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# or 3) input page number is greater than total number of pages
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# or 4) input page number for end is less than page number for beginning
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# 8. If the user enters an invalid page number:
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# - Warn the user that the entry is invalid
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# - Return to step 6.
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# This solution also check that the ending page number is not less than the starting
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# page number, and that it is not greater than the last page in the PDF
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while (
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notpage_end.isdigit()
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orpage_end=="0"
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ifpage_endisNone:# exit on "Cancel"
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exit()
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#lettheuser choose an output file name
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#9. Ask forthelocation to save the extracted pages
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output_file_path=gui.filesavebox("","Save the trimmed PDF as...","*.pdf")
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# 10. If the user does not select a save location, exit the program.
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ifoutput_file_pathisNone:
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exit()
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# 11. If the chosen save location is the same as the input file path:
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# - Warn the user that they can not overwrite the input file.
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# - Return the step 9.
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whileinput_file_path==output_file_path:# cannot use same file as input
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gui.msgbox(
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"Cannot overwrite original file!","Please choose another file..."
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)
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output_file_path=gui.filesavebox(
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"","Save the trimmed PDF as...","*.pdf"
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)
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ifoutput_file_pathisNone:
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exit()# exit on "Cancel"
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ifoutput_file_pathisNone:
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exit()
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#read in file, write new file with trimmedpagerange and save the new file
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#12. Perform thepageextraction
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output_PDF=PdfFileWriter()
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# subtract 1 from supplied start page number to get correct index value
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forpage_numinrange(int(page_start)-1,int(page_end)):
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page=input_file.getPage(page_num)
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output_PDF.addPage(page)

‎ch17-graphical-user-interfaces/4-control-layout-with-geometry-managers.py

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# 17.4 - Introduction to Tkinter
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# Review exercises
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importtkinterastk
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# Exercise 1
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window=tk.Tk()
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label=tk.Label(text="GUIs are great!")
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label.pack()
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window.mainloop()
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# Exercise 2
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window=tk.Tk()
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label=tk.Label(text="Python rocks!")
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label.pack()
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window.mainloop()
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# Exercise 3
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window=tk.Tk()
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label=tk.Label(text="Engage!")
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label.pack()
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window.mainloop()
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# 17.4 - Introduction to Tkinter
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# Review exercises
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importtkinterastk
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# Exercise 1 asks you to recreate all the windows in the chapter.
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# The source code for each window can be found in the chapter text.
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# Exercise 2
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window=tk.Tk()
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button=tk.Button(
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width=50,height=25,bg="white",fg="blue",text="Click here"
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)
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button.pack()
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window.mainloop()
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# Exercise 3
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window=tk.Tk()
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entry=tk.Entry(width=40)
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entry.insert(0,"What is your name?")
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entry.pack()
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window.mainloop()

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