How it works...

Both classes accept the from_ and to options to indicate the range of valid values—the trailing underscore is necessary because the from option was originally defined in Tcl/Tk, but it is a reserved keyword in Python.

A handy functionality of the Scale class is the resolution option, which sets the precision of the rounding. For instance, a resolution of 0.2 will allow the user to select the values 0.0, 0.2, 0.4, and so on. The value of this option is 1 by default, so the widget rounds all values to the nearest integer.

As usual, the value of each widget can be retrieved with the get() method. An important difference is that Spinbox returns the number as a string, whereas Scale returns an integer value or a float value if the rounding accepts decimal values.