Resistor calculation

"""
Code by: erynur
Contact: [email protected]

Feel free to use this code for personal or educational purpose
"""

import base64
from urllib.request import urlopen
try:
    from tkinter import Tk, Button, Label, Frame, Menu, Entry, Radiobutton, StringVar, PhotoImage, messagebox

except ImportError:
    from Tkinter import Tk, Button, Label, Frame, Menu, Entry, Radiobutton, StringVar, PhotoImage


value_colors = {
    'black': 0,
    'brown': 1,
    'red': 2,
    'orange': 3,
    'yellow': 4,
    'green': 5,
    'blue': 6,
    'violet': 7,
    'grey': 8,
    'white': 9
    }

multiplier_colors = {
    'black': (1, ''),
    'brown': (10, ''),
    'red': (100, ''),
    'orange': (1, 'K'),
    'yellow': (10, 'K'),
    'green': (100, 'K'),
    'blue': (1, 'M'),
    'violet': (10, 'M'),
    'grey': (100, 'M'),
    'white': (1, 'G'),
    'gold': (0.1, ''),
    'silver': (0.01, '')
}

tolerance_colors = {
    'brown': '1%',
    'red': '2%',
    'green': '0.5%',
    'blue': '0.25%',
    'violet': '0.1%',
    'grey': '0.05%',
    'gold': '5%',
    'silver': '10%'
}


def quit_application():
    quit()


def activate():
    entry_ring_3.config(state='normal')


def deactivate():
    entry_ring_3.config(state='disabled')


def calculate(n):
    try:
        ring_1 = entry_ring_1.get().lower()
        ring_2 = entry_ring_2.get().lower()
        ring_3 = entry_ring_3.get().lower()
        multiplier = multiplier_colors[entry_multiplier.get().lower()]
        tolerance = tolerance_colors[entry_tolerance.get().lower()]
        if n == '5':
            res = str(value_colors[ring_1]) + str(value_colors[ring_2]) + str(value_colors[ring_3])
        else:
            res = str(value_colors[ring_1]) + str(value_colors[ring_2])
        res = str(int(res) * multiplier[0]) + multiplier[1] + ' +/- ' + tolerance
        result.set(res)
    except KeyError:
        messagebox.showinfo(title='Wrong input', message='Wrong input')
        root.destroy()


root = Tk()


# Menubar to Quit the game
menuBar = Menu(root)
root.config(menu=menuBar)

subMenuFile = Menu(menuBar, tearoff=0)
menuBar.add_cascade(label='File', menu=subMenuFile)
subMenuFile.add_command(label='Quit', command=quit_application)

image_byt = urlopen('https://www.digikey.com/-/media/Images/Marketing/Resources/Calculators/resistor-color-chart.png?ts=e802ab48-1ea0-4745-babf-9a21accec5c2&la=en-US').read()
image_b64 = base64.encodebytes(image_byt)

resistor_color = PhotoImage(data=image_b64)

image_label = Label(root, image=resistor_color)
image_label.grid(row=0, column=0, columnspan=5)

label_ring_1 = Label(root, text='Ringfarbe 1:')
label_ring_1.grid(row=2, column=0)
label_ring_2 = Label(root, text='Ringfarbe 2:')
label_ring_2.grid(row=2, column=1)
label_ring_3 = Label(root, text='Ringfarbe 3:')
label_ring_3.grid(row=2, column=2)
label_multiplier = Label(root, text='Multiplier:')
label_multiplier.grid(row=2, column=3)
label_tolerance = Label(root, text='Tolerance:')
label_tolerance.grid(row=2, column=4)

label_result = Label(root, text='Result')
label_result.grid(row=5, column=1)

result = StringVar()
result.set('Ergebnis')
show_result = Label(root, textvariable=result)
show_result.grid(row=5, column=4)

radiobutton_value = StringVar()

radiobutton_4_rings = Radiobutton(
    root,
    text='4 Rings',
    value=4,
    variable=radiobutton_value,
    indicatoron=0,
    command=deactivate
)
radiobutton_4_rings.grid(row=1, column=1)
radiobutton_4_rings.select()

radiobutton_5_rings = Radiobutton(
    root,
    text='5 Rings',
    value=5,
    variable=radiobutton_value,
    indicatoron=0,
    command=activate
)
radiobutton_5_rings.grid(row=1, column=3)

entry_ring_1 = Entry(
    root,
    justify='center'
)
entry_ring_1.grid(row=3, column=0)
entry_ring_2 = Entry(root, justify='center')
entry_ring_2.grid(row=3, column=1)
entry_ring_3 = Entry(
    root,
    justify='center',
    state='disabled',
    disabledbackground='darkgrey'
)
entry_ring_3.grid(row=3, column=2)
entry_multiplier = Entry(root, justify='center')
entry_multiplier.grid(row=3, column=3)
entry_tolerance = Entry(root, justify='center')
entry_tolerance.grid(row=3, column=4)

calculate_button = Button(
    root,
    text='Show',
    command=lambda: calculate(radiobutton_value.get()),
    state='active'
)
calculate_button.grid(row=4, column=2)

root.mainloop()