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: How many visible components does this code display in the window? a. 8 b. 5 c. 7 d. 6

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: How many visible components does this code display in the window? a. 8 b. 5 c. 7 d. 6

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: How many visible components does this code display in the window?

a.
8

b.
5

c.
7

d.
6

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