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Nancy MelucciCourses Plus Student 34,558 Points
Extracting numeric values from tkinter entry boxes in Python
I am tasked with making a simple calculator to take a purchase amount and calculate total amount paid (with interest) and monthly payments. I don't have that much experience with the GUI library tkinter, so I am struggling with how to make the entry boxes yield the float and int variables necessary to complete the task. I have looked at so many error messages and so many online examples of how to do it that I just can't interpret. I know there isn't a lot of tkinter stuff here but I am hoping someone can show me how to turn the entries into amount, rate and years...the code below is for an intermediate stage. I'll deal with interest form once I have the correcly parsed numbers.
from tkinter import * from tkinter import messagebox def multiply(var1, var2, var3): product = var1 * var2 * var3 messagebox.showinfo(str(product)) return product def btnClick(event): x = float(entry.get()) main = Tk() main.title("Assignment 16") main.geometry("500x500") main["bg"] = "#000066" lblFirst = Label(main, text="Amount to Pay: ") lblFirst.grid(row=0, column=3, pady=5) amount = " " amount.set("default") entry = Entry(main, width=20) entry.grid(row=0, column=4) lblSecond = Label(main, text="Interest Rate (like 7.5): ") lblSecond.grid(row=2, column=3, pady=10) rate = " " rate.set("default") entry2 = Entry(textvariable=rate) entry2.grid(row=2, column=4) lblThird = Label(main, text="Years to Pay: ") lblThird.grid(row=4, column=3, pady=15) years = " " years.set("default") entry3 = Entry(textvariable=years) entry3.grid(row=4, column=4) num3 = int(years) lblFourth = Label(main, text="Monthly Payment: ") lblFourth.grid(row=6, column=3, pady=15) lblFourthTwo = Label(main, text="XXXXX") lblFourthTwo.grid(row=6, column=4) lblFifth = Label(main, text="Total of Paymenta: ") lblFifth.grid(row=8, column=3, pady=15) lblFifthTwo = Label(main, text="XXXXX") lblFifthTwo.grid(row=8, column=4) button1 = Button(main, text="Convert", width=10, command=btnClick) button2 = Button(main, text="Calculate", width=10, command=multiply(amount, rate, years)) button1.grid(padx=20, pady=20) messagebox(amount, rate, years) main.mainloop()