1. import tkinter as tk 2. from tkinter import ttk 3. class TipCalcFrame(ttk.Frame): 4. def __init__(self, parent): 5. ttk.Frame.__init__(self, parent, padding="20 20 20 20") 6. self.pack() 7. self.mealCost = tk.StringVar() 8. self.tipPercent = tk.StringVar() 9. self.tipAmount = tk.StringVar() 10. ttk.Label(self, text="Cost of your meal:").grid( column=0, row=0, sticky=tk.E) 11. ttk.Entry(self, width=30, textvariable=self.mealCost).grid( column=1, row=0) 12. ttk.Label(self, text="Percent to leave as a tip:").grid( column=0, row=1, sticky=tk.E) 13. ttk.Entry(self, width=30, textvariable=self.tipPercent).grid( column=1, row=1) 14. ttk.Label(self, text="Tip amount:").grid( column=0, row=2, sticky=tk.E) 15. ttk.Entry(self, width=30, textvariable=self.tipAmount, state="readonly").grid(column=1, row=2) 16. ttk.Button(self, text="Calculate", command=self.calculate).grid(column=1,row=3, sticky=tk.E) 17. for child in self.winfo_children(): 18. child.grid_configure(padx=5, pady=3) 19. def calculate(self): 20. mealCost = float(self.mealCost.get()) 21. tipPercent = float(self.tipPercent.get()) 22. tipPercent = tipPercent/100 23. tip = mealCost * tipPercent 24. yourTip = "$" + str(round(tip, 2)) 25. self.tipAmount.set(yourTip) 26. if __name__ == "__main__": 27. root = tk.Tk() 28. root.title("Tip Calculator") 29. TipCalcFrame(root) 30. root.mainloop() Refer to Code Example 18-2: What does the GUI do if the user enters the cost of the meal and the tip percent and clicks the Calculate button? a. It calculates the amount of a tip to leave based on the user’s input, but it can’t display it because the Entry text field is read only. b. It calculates and displays the amount of a tip to leave based on the user’s input. c. It calculates and displays the total amount to leave based on the user’s input. d. It doesn’t do anything because the calculate() method isn’t connected to the Calculate button.

1. import tkinter as tk 2. from tkinter import ttk 3. class TipCalcFrame(ttk.Frame): 4. def init(self, parent): 5. ttk.Frame.init(self, parent, padding="20 20 20 20") 6. self.pack() 7. self.mealCost = tk.StringVar() 8. self.tipPercent = tk.StringVar() 9. self.tipAmount = tk.StringVar() 10. ttk.Label(self, text="Cost of your meal:").grid( column=0, row=0, sticky=tk.E) 11. ttk.Entry(self, width=30, textvariable=self.mealCost).grid( column=1, row=0) 12. ttk.Label(self, text="Percent to leave as a tip:").grid( column=0, row=1, sticky=tk.E) 13. ttk.Entry(self, width=30, textvariable=self.tipPercent).grid( column=1, row=1) 14. ttk.Label(self, text="Tip amount:").grid( column=0, row=2, sticky=tk.E) 15. ttk.Entry(self, width=30, textvariable=self.tipAmount, state="readonly").grid(column=1, row=2) 16. ttk.Button(self, text="Calculate", command=self.calculate).grid(column=1,row=3, sticky=tk.E) 17. for child in self.winfo_children(): 18. child.grid_configure(padx=5, pady=3) 19. def calculate(self): 20. mealCost = float(self.mealCost.get()) 21. tipPercent = float(self.tipPercent.get()) 22. tipPercent = tipPercent/100 23. tip = mealCost * tipPercent 24. yourTip = "$" + str(round(tip, 2)) 25. self.tipAmount.set(yourTip) 26. if name == "main": 27. root = tk.Tk() 28. root.title("Tip Calculator") 29. TipCalcFrame(root) 30. root.mainloop() Refer to Code Example 18-2: What does the GUI do if the user enters the cost of the meal and the tip percent and clicks the Calculate button? a. It calculates the amount of a tip to leave based on the user’s input, but it can’t display it because the Entry text field is read only. b. It calculates and displays the amount of a tip to leave based on the user’s input. c. It calculates and displays the total amount to leave based on the user’s input. d. It doesn’t do anything because the calculate() method isn’t connected to the Calculate button.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Code Example 18-2
1. import tkinter as tk
2. from tkinter import ttk
3. class TipCalcFrame(ttk.Frame):
4.      def __init__(self, parent):
5.          ttk.Frame.__init__(self, parent, padding="20 20 20 20")
6.          self.pack()
7.          self.mealCost = tk.StringVar()
8.          self.tipPercent = tk.StringVar()
9.          self.tipAmount = tk.StringVar()
10.         ttk.Label(self, text="Cost of your meal:").grid(
                      column=0, row=0, sticky=tk.E)
11.         ttk.Entry(self, width=30, textvariable=self.mealCost).grid(
                      column=1, row=0)
12.         ttk.Label(self, text="Percent to leave as a tip:").grid(
                      column=0, row=1, sticky=tk.E)
13.         ttk.Entry(self, width=30, textvariable=self.tipPercent).grid(
                      column=1, row=1)
14.         ttk.Label(self, text="Tip amount:").grid(
                      column=0, row=2, sticky=tk.E)
15.         ttk.Entry(self, width=30, textvariable=self.tipAmount,
                      state="readonly").grid(column=1, row=2)
16.         ttk.Button(self, text="Calculate",
                   command=self.calculate).grid(column=1,row=3, sticky=tk.E)
17.         for child in self.winfo_children():
18.             child.grid_configure(padx=5, pady=3)
19.     def calculate(self):
20.         mealCost = float(self.mealCost.get())
21.         tipPercent = float(self.tipPercent.get())
22.         tipPercent = tipPercent/100
23.         tip = mealCost * tipPercent
24.         yourTip = "$" + str(round(tip, 2))
25.         self.tipAmount.set(yourTip)
26. if __name__ == "__main__":
27.     root = tk.Tk()
28.     root.title("Tip Calculator")
29.     TipCalcFrame(root)
30.     root.mainloop()

Refer to Code Example 18-2: What does the GUI do if the user enters the cost of the meal and the tip percent and clicks the Calculate button?

	a.	It calculates the amount of a tip to leave based on the user’s input, but it can’t display it because the Entry text field is read only.
	b.	It calculates and displays the amount of a tip to leave based on the user’s input.
	c.	It calculates and displays the total amount to leave based on the user’s input.
	d.	It doesn’t do anything because the calculate() method isn’t connected to the Calculate button.

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