Tkinter & Tk resources

highlightthickness=0, relief='ridge', bd=0

foo = PhotoImage # foo may clear by garbage collection, can assign to class to prevent
button.image = foo

The following are some of the most useful methods: 

- winfo_class: a class identifying the type of widget, e.g. TButton for a themed button
- winfo_children: a list of widgets that are the direct children of a widget in the hierarchy
- winfo_parent: parent of the widget in the hierarchy
- winfo_toplevel: the toplevel window containing this widget 
- winfo_width, winfo_height: current width and height of the widget; not accurate until appears onscreen 
- winfo_reqwidth, winfo_reqheight: the width and height the widget requests of the geometry manager (more on this shortly) 
- winfo_x, winfo_y: the position of the top-left corner of the widget relative to its parent 
- winfo_rootx, winfo_rooty: the position of the top-left corner of the widget relative to the entire screen the position of the top-left corner of the widget relative to its parent 
- winfo_rootx, winfo_rooty: the position of the top-left corner of the widget relative to the entire screen 
- winfo_vieweable: whether the widget is displayed or hidden (all its ancestors in the hierarchy must be viewable for it to be viewable)

screen_width = win.winfo_screenwidth()
screen_height = win.winfo_screenheight()
#Print the screen size
print("Screen width:", screen_width)
print("Screen height:", screen_height)

def print_hierarchy(w, depth=0):
    print('  '*depth + w.winfo_class() + ' w=' + str(w.winfo_width()) + ' h=' + str(w.winfo_height()) + ' x=' + str(w.winfo_x()) + ' y=' + str(w.winfo_y()))
    for i in w.winfo_children():
        print_hierarchy(i, depth+1)
print_hierarchy(root)

grid_slaves()
w.grid_remove()
destroy()
grid_forget
w.grid()

# destroy
for widget in frame.winfo_children():
    widget.destroy()

Control
Mod1, M1, Command
Alt
Mod2, M2, Option
Shift
Mod3, M3
Lock
Mod4, M4
Extended
Mod5, M5
Button1, B1
Meta, M
Button2, B2
Double
Button3, B3
Triple
Button4, B4
Quadruple
Button5, B5

Activate
Destroy
Map
ButtonPress, Button
Enter
MapRequest
ButtonRelease
Expose
Motion
Circulate
FocusIn
MouseWheel
CirculateRequest
FocusOut
Property
Colormap
Gravity
Reparent
Configure
KeyPress, Key
ResizeRequest
ConfigureRequest
KeyRelease
Unmap
Create
Leave
Visibility
Deactivate

label.bind('<Button-1>', left_mouse_down) 
label.bind('<ButtonRelease-1>', left_mouse_up)
label.bind('<Button-3>', right_mouse_down)
label.bind('<ButtonRelease-3>', right_mouse_up)
label.bind('<B1-Motion>', moving_mouse)
label.bind('<Enter>', moving_into)
label.bind('<Leave>', moving_out)
label.bind('<FocusIn>', focus)
label.bind('<FocusOut>', unfocus)
<Double-Button-1>
<MouseWheel>
<Button-4>
<Button-5>
<Control-Button-1>
<space> # lower case
frame.bind('<Control-Shift-S>', key)

bind & bind_all
bind_all: a certain event calls a handler no matter what widget has the focus or is under the mouse

# Create style Object
style = Style()

style.configure('TButton', font =
               ('calibri', 20, 'bold'),
                    borderwidth = '4')

# Changes will be reflected
# by the movement of mouse.
style.map('TButton', foreground = [('active', '! disabled', 'green')],
                     background = [('active', 'black')])