Jim Hodgen wrote:
I am learning Python with a minesweeper-engine project. Future
activities turn my attention to exploring the use of dictionaries as
sparse matrices, hence the representation of the gameboard.
Why can't I fill the dictionary-as-a-matrix with an instance of class
Square? Why do I need a custom method to make the assignment? What
am I not understanding?
You don't have a sparse matrix here. There is a dictionary entry for
every square. You might as well use a nested list or an array from one
of the array modules.
If you want a Baseboard instance to directly accept keyed assignment use:
class Basebaord(dict)
and drop boardsquares.
*_# basics module (mineswobj1)contents..._*
class Square:
mined = True # False if empty, True if mined, no
other values allowed
marked = 0 # False if 0, marked-as-mined if 1,
marked-as-unknown if 2, no other values allowed
displaystate = 0 # covered if 0, marked if 1, exposed if
2, selected if 3, no other values allowed
marked and display state are in conflict and overlap. Consider instead:
selected = False
displaystate is one of covered-blank, covered-marked, mined, exposed
minedneighbors = 0 # number of mined neighboring squares, max
legit value = 8
class Baseboard:
xdimension = 0 # x-dimension of the gameboard, integer
value greater than 0
ydimension = 0 # y-dimension of the gameboard, integer
value greater than 0
minenumber = 0 # number of mines on the board for play,
value from 0 to (xdimension * ydimension)
state = 0 # playable if 0, not-playable-exploded
if 1, not-playable-solved if 2
boardsquares = {} # dictionary used to emulate an addressable 2
dimensional grid where an instance of class Square
# is inserted with a key consisting
of a tuple describing its zero-based address in the grid
def initializeboard(xdim, ydim, minenum):
gameboard = Baseboard()
for yct in range(ydim):
for xct in range(xdim):
gameboard[(xct,yct)] = Square()
print 'gameboard[(',xct,yct, ')] =', gameboard[(xct,yct)]
*_# driver module contents_*
import basics
mineswobj1.initializeboard(3, 4, 5)
_*#error message*_
Traceback (most recent call last):
File "C:\jmh\Python\minedriver0.py", line 6, in <module>
mineswobj1.initializeboard(3, 4, 5)
File "C:\jmh\Python\mineswobj1.py", line 26, in initializeboard
gameboard[(xct,yct)] = Square()
AttributeError: Baseboard instance has no attribute '__setitem__'
------------------------------------------------------------------------
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Bob Gailer
Chapel Hill NC
919-636-4239
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