Simple UI App.py

# A Simple UI App


import tkinter as tk
from tkinter import ttk

# Create instance
win = tk.Tk()

# Add a title
win.title("Python GUI")

# Disable resizing the GUI
# win.resizable(0,0)

# Modify adding a Label
aLabel = ttk.Label(win, text="A Label")
aLabel.grid(column=0, row=0)

# Button Click Event Function
def clickMe():
    action.configure(text='Hello ' + name.get())

# Changing our Label
ttk.Label(win, text="Enter a name:").grid(column=0, row=0)

# Adding a Textbox Entry widget
name = tk.StringVar()
nameEntered = ttk.Entry(win, width=12, textvariable=name)
nameEntered.grid(column=0, row=1)

# Adding a Button
action = ttk.Button(win, text="Click Me!", command=clickMe)
action.grid(column=2, row=1)
# action.configure(state='disabled')    # Disable the Button Widget

ttk.Label(win, text="Choose a number:").grid(column=1, row=0)
number = tk.StringVar()
numberChosen = ttk.Combobox(win, width=12, textvariable=number)
numberChosen['values'] = (1, 2, 4, 42, 100)
numberChosen.grid(column=1, row=1)
numberChosen.current(0)

# Creating three checkbuttons
chVarDis = tk.IntVar()
check1 = tk.Checkbutton(win, text="Disabled", variable=chVarDis, state='disabled')
check1.select()
check1.grid(column=0, row=4, sticky=tk.W, columnspan=3)

chVarUn = tk.IntVar()
check2 = tk.Checkbutton(win, text="UnChecked", variable=chVarUn)
check2.deselect()
check2.grid(column=1, row=4, sticky=tk.W, columnspan=3)

chVarEn = tk.IntVar()
check3 = tk.Checkbutton(win, text="Enabled", variable=chVarEn)
check3.select()
check3.grid(column=2, row=4, sticky=tk.W, columnspan=3)


# GUI Callback function
def checkCallback(*ignoredArgs):
    # only enable one checkbutton
    if chVarUn.get(): check3.configure(state='disabled')
    else:       check3.configure(state='normal')
    if chVarEn.get(): check2.configure(state='disabled')
    else:       check2.configure(state='normal')

# trace the state of the two checkbuttons
chVarUn.trace('w', lambda unused0, unused1, unused2 : checkCallback())
chVarEn.trace('w', lambda unused0, unused1, unused2 : checkCallback())

# Radiobutton Globals
COLOR1 = "Blue"
COLOR2 = "Gold"
COLOR3 = "Red"

# Radiobutton Callback
def radCall():
    radSel=radVar.get()
    if   radSel == 1: win.configure(background=COLOR1)
    elif radSel == 2: win.configure(background=COLOR2)
    elif radSel == 3: win.configure(background=COLOR3)

# create three Radiobuttons using one variable
radVar = tk.IntVar()

rad1 = tk.Radiobutton(win, text=COLOR1, variable=radVar, value=1, command=radCall)
rad1.grid(column=0, row=5, sticky=tk.W, columnspan=3)

rad2 = tk.Radiobutton(win, text=COLOR2, variable=radVar, value=2, command=radCall)
rad2.grid(column=1, row=5, sticky=tk.W, columnspan=3)

rad3 = tk.Radiobutton(win, text=COLOR3, variable=radVar, value=3, command=radCall)
rad3.grid(column=2, row=5, sticky=tk.W, columnspan=3)

nameEntered.focus()      # Place cursor into name Entry
#======================
# Start GUI
#======================
win.mainloop()