7. PageTurner.__init__(): The
constructor
The constructor has four general duties: call the parent class
constructor; process the arguments; set up invariants on
the attributes; and create the widgets. The
latter is delegated to the .__createWidgets() method.
pageturner.py
# - - - P a g e T u r n e r . _ _ i n i t _ _ - - -
def __init__ ( self, master=None, size=None ):
"""Constructor for the PageTurner widget."""
#-- 1 --
# [ master := master with a new Frame added but not gridded
# self := that new Frame ]
Frame.__init__ ( self, master )
#-- 2 --
self.__size = size
#-- 3 --
self.__pageList = []
self.__pageNo = 0
#-- 4 --
# [ self := self with all widgets created ]
self.__createWidgets()
