update

Author: Andreas Kugel

src/2a-chessPrint.py

@@ -0,0 +1,49 @@
+""" Demonstrate fundamental programming elements
+by creating a checker board, 8 by 8 fields, 
+field size is configurable, same width and height
+"""
+
+# function to make one linear segment of a pattern
+def segment(width, color):
+    """ print <width> items of a color """
+    # add items with a FOR LOOP
+    for i in range(width):
+        # print(color,end="") # simple verion
+        print("{0:2d}".format(color),end="") # this looks better
+
+# the main function 
+def main():
+    """create a checker board pattern using a function"""
+
+    # constants
+    fields = 8
+    fieldWidth = 4
+    
+    # variables
+    row = 0
+    column = 0
+    # set color to 0
+    color = 0
+    while row < fields*fieldWidth and column < fields*fieldWidth:
+        # print segment
+        segment(fieldWidth,color)
+        # invert color
+        color = 1 if color == 0 else 0
+        # increment column
+        column = column + fieldWidth if column < fieldWidth*(fields-1) else 0
+        # new line and increment row if column = 0
+        if column == 0:
+            print("") # prints a new line
+            # reset line
+            row = row + 1
+        # invert color again if new row and end of field
+        if column == 0 and row % fieldWidth == 0 :
+            color = 1 if color == 0 else 0
+        
+
+# call the main function
+if __name__ == "__main__":
+    main()
+    
+
+    

src/2b-chessList.py

@@ -0,0 +1,62 @@
+""" Demonstrate fundamental programming elements
+by creating a checker board, 8 by 8 fields, 
+field size is configurable, same width and height
+"""
+
+# function to make one linear segment of a pattern
+def segment(width, color):
+    """ put <width> items of color in a row starting at position row,col (= y,x)"""
+    # initialize a new list as a numpy array
+    segment = []
+    # add items with a FOR LOOP
+    for i in range(width):
+        segment.append(color)
+    # return the list
+    return segment
+
+# the main function 
+def main():
+    """create a checker board pattern using a function"""
+
+    # constants
+    fields = 8
+    fieldWidth = 2
+    
+    # variables
+    row = 0
+    column = 0
+    # set color to 0
+    color = 0
+    # create the empty board
+    board = []
+    # create an empty line to start with
+    line = []
+    while row < fields*fieldWidth and column < fields*fieldWidth:
+        # append the segment to the line
+        line.append(segment(fieldWidth,color))
+        # invert color
+        color = 1 if color == 0 else 0
+        # increment column
+        column = column + fieldWidth if column < fieldWidth*(fields-1) else 0
+        # add line to board and increment row if column = 0
+        if column == 0:
+            board.append(line)
+            # reset line
+            line = []
+            row = row + 1
+        # invert color again if new row and end of field
+        if column == 0 and row % fieldWidth == 0 :
+            color = 1 if color == 0 else 0
+        
+
+    print("Checker board")
+    for b in board:
+        print(b)
+    
+
+# call the main function
+if __name__ == "__main__":
+    main()
+    
+
+    

src/2c-chessNp.py

@@ -0,0 +1,58 @@
+""" Demonstrate fundamental programming elements
+by creating a checker board, 8 by 8 fields, 
+field size is configurable, same width and height
+"""
+
+# numpy is a helper library
+import numpy as np
+
+# function to make one linear segment of a pattern
+def segment(width, color):
+    """ put <width> items of color in a row starting at position row,col (= y,x)"""
+    # initialize a new list as a numpy array
+    segment = np.empty(width) # 
+    # add items with a FOR LOOP
+    for i in range(width):
+        segment[i] = color
+    # return the list
+    return segment
+
+# the main function 
+def main():
+    """create a checker board pattern using a function"""
+
+    # constants
+    fields = 8
+    fieldWidth = 2
+    
+    # variables
+    row = 0
+    column = 0
+    # set color to 0
+    color = 0
+    # create the board matrix
+    board = np.empty((fields*fieldWidth,fields*fieldWidth))
+    while row < fields*fieldWidth and column < fields*fieldWidth:
+        # append the segment
+        board[row,column:column+fieldWidth] = segment(fieldWidth,color)
+        # invert color
+        color = 1 if color == 0 else 0
+        # increment column
+        column = column + fieldWidth if column < fieldWidth*(fields-1) else 0
+        # increment row if column = 0
+        row = row + 1 if column == 0 else row
+        # invert color again if new row and end of field
+        if column == 0 and row % fieldWidth == 0 :
+            color = 1 if color == 0 else 0
+        
+
+    print("Checker board")
+    print(board)
+    
+
+# call the main function
+if __name__ == "__main__":
+    main()
+    
+
+