1 from tkinter import *
2
3 #Import Tk themed widgets
4 from tkinter import ttk
5
6 class Loan_Calculator():
7
8 def __init__(self):
9
10 #creating the root window here
11 root = Tk()
12
13 #set the title
14 root.title('Loan Calculator')
15
16 #set the geometry
17 #root.geometry('250x300')
18
19 #set the background color
20 root.config(background='beige')
21
22 #creating the labels
23 Label(root,text='Annual Interest Rate',bg='Beige' , borderwidth = 4).grid(row=1,column = 1,sticky = W)
24
25 Label(root,text='Numbers of Years',bg='Beige' , borderwidth = 4).grid(row=2,column = 1,sticky = W)
26
27 Label(root,text='Loan Ammount',bg='Beige' , borderwidth = 4).grid(row=3,column = 1,sticky = W)
28
29 Label(root,text='Monthly Payment',bg='Beige' , borderwidth = 4).grid(row=4 ,column = 1,sticky = W)
30
31 Label(root,text='Total Payment',bg='Beige' , borderwidth = 4).grid(row=5,column = 1,sticky = W)
32
33 #Create the Entry Widgets
34 self.AnnualInterest = StringVar()
35 Entry(root, textvariable = self.AnnualInterest,justify = RIGHT).grid(row = 1,column = 2,sticky = E)
36
37 self.years = StringVar()
38 Entry(root, textvariable = self.years,justify = RIGHT).grid(row = 2,column = 2,sticky = E)
39
40 self.amount = StringVar()
41 Entry(root, textvariable = self.amount,justify = RIGHT).grid(row = 3,column = 2,sticky = E)
42
43 self.monthlyPayment = StringVar()
44 Label(root, textvariable = self.monthlyPayment).grid(row = 4,column = 2,sticky = E)
45
46 self.TotalPayment = StringVar()
47 Label(root, textvariable = self.TotalPayment).grid(row = 5,column = 2,sticky = E)
48
49 #CREATING BUTTONS
50 compute = Button(root, text = 'Compute Loan',command = self.ComputePayment).grid(row = 6, column = 2,sticky = E)
51
52 root.mainloop()
53
54 # compute the total payment.
55 def ComputePayment(self):
56
57 month = self.getMonthlyPayment(
58 float(self.amount.get()),
59 float(self.AnnualInterest.get()) / 1200,
60 int(self.years.get()))
61
62 self.monthlyPayment.set(format(month, '10.2f'))
63
64 total = float(self.monthlyPayment.get()) * 12 * int(self.years.get())
65
66 self.TotalPayment.set(format(total, '10.2f'))
67
68 def getMonthlyPayment(self, loanAmount, monthlyInterestRate, numberOfYears):
69 # compute the monthly payment.
70 month = loanAmount * monthlyInterestRate / (1
71 - 1 / (1 + monthlyInterestRate) ** (numberOfYears * 12))
72 return month;
73
74 Loan_Calculator()
