PCPP1 Graphical User Interface Programming — 10 Questions

Question 1

You have a Checkbutton and you need to track its state. What is the recommended way to associate a variable with the Checkbutton?

Accepted Answer

Pass a BooleanVar object to the 'variable' parameter.. A BooleanVar or IntVar should be passed to the 'variable' parameter of the Checkbutton.

Answer

Use the 'onvalue' parameter.

Answer

Use the state attribute directly.

Answer

Use the 'command' parameter to set a global flag.

Question 2

You want to create a button that closes the GUI application when clicked. Which method should you call inside the command callback?

Accepted Answer

root.destroy(). The destroy() method on the root window object terminates the Tkinter application.

Answer

root.close()

Answer

root.exit()

Answer

root.quit()

Question 3

You want to bind a function 'on_click' to a left mouse button click on a Button widget. Which event sequence string is correct?

Accepted Answer

. The event sequence '' corresponds to the primary (left) mouse button.

Answer

<Mouse-1>

Answer

<Left-Click>

Answer

<Click-1>

Question 4

You need to add a label that displays static text in your GUI. Which widget is most appropriate for this purpose?

Accepted Answer

tk.Label(). The Label widget is designed specifically for displaying non-editable text or images.

Answer

tk.Message()

Answer

tk.Entry()

Answer

tk.Display()

Answer

tk.Text()

Question 5

In a Tkinter grid layout, you want a button to span across two columns. Which parameter should you use?

Accepted Answer

columnspan=2. The columnspan parameter in the grid() method manager allows a widget to occupy multiple columns.

Answer

span_cols=2

Answer

merge=2

Answer

cols=2

Question 6

You have a Tkinter Entry widget and want to retrieve the text currently entered by the user. Which method do you call on the Entry instance?

Accepted Answer

entry.get(). The get() method is used to retrieve the current contents of Entry and Text widgets.

Answer

entry.content()

Answer

entry.text()

Answer

entry.value()

Question 7

When using the pack geometry manager, you want a widget to fill the available space in the parent container. Which argument for the 'fill' parameter should you use to make it expand in both horizontal and vertical directions?

Accepted Answer

fill=tk.BOTH. The 'BOTH' constant from the tkinter module is used with the fill parameter to expand in both dimensions.

Answer

fill='all'

Answer

fill='both'

Answer

fill=tk.EXPAND

Question 8

You are creating a simple Tkinter application and notice that your window does not appear on the screen after calling the Tk() constructor. Which method must be called to start the event loop?

Accepted Answer

root.mainloop(). The mainloop() method is required to start the Tkinter event loop, which listens for events and updates the display.

Answer

root.show()

Answer

root.render()

Answer

root.run()

Question 9

To prevent a user from editing text in a widget, which configuration option should you set?

Accepted Answer

state=tk.DISABLED. Setting 'state' to 'disabled' prevents user interaction with the widget.

Answer

editable=False

Answer

enabled=False

Answer

readonly=True

Question 10

Which module must be imported to utilize Tkinter in a Python script?

Accepted Answer

import tkinter. The 'tkinter' module is the standard Python interface to the Tk GUI toolkit.

Answer

import gui

Answer

from python import gui

Answer

import tk