Widget Fundamentals
The
Tkinter module supplies many kinds of widgets, and
most of them have several things in common. All widgets are instances
of classes that inherit from class Widget. Class
Widget itself is abstract;
that is, you never instantiate Widget itself. You
only instantiate concrete subclasses corresponding to specific kinds
of widgets. Class Widget’s
functionality is common to all the widgets you
instantiate.
To instantiate any kind of widget, call the widget’s
class. The first argument is the parent window of the widget, also
known as the widget’s master.
If you omit this positional argument, the widget’s
master is the application’s main window. All other
arguments are in named form,
option
=
value.
You can also set or change options on an existing widget
w by calling
w
.config(
option
=
value
).
You can get an option of w by calling
w.
cget('option'),
which returns the option’s value. Each widget
w is a mapping, so you can also get an
option as
w
['option']
and set or change it with
w
['option']=
value.
Common Widget Options
Many widgets accept some common options. Some options affect a widget’s colors, others affect lengths (normally in pixels), and there are various other kinds. This section details the most commonly used options.
Color options
Tkinter represents colors with
strings. The string can be a color name, such as
'red' or 'orange', or it may be
of the form
'#
RRGGBB',
where each of R,
G, and B is a hexadecimal digit, to represent a color by the values ...
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