python-3.6.zip added from Github

README.cosmo contains the necessary links.

third_party/python/Tools/demo/life.py

@@ -0,0 +1,262 @@
+#!/usr/bin/env python3
+
+"""
+A curses-based version of Conway's Game of Life.
+
+An empty board will be displayed, and the following commands are available:
+ E : Erase the board
+ R : Fill the board randomly
+ S : Step for a single generation
+ C : Update continuously until a key is struck
+ Q : Quit
+ Cursor keys :  Move the cursor around the board
+ Space or Enter : Toggle the contents of the cursor's position
+
+Contributed by Andrew Kuchling, Mouse support and color by Dafydd Crosby.
+"""
+
+import curses
+import random
+
+
+class LifeBoard:
+    """Encapsulates a Life board
+
+    Attributes:
+    X,Y : horizontal and vertical size of the board
+    state : dictionary mapping (x,y) to 0 or 1
+
+    Methods:
+    display(update_board) -- If update_board is true, compute the
+                             next generation.  Then display the state
+                             of the board and refresh the screen.
+    erase() -- clear the entire board
+    make_random() -- fill the board randomly
+    set(y,x) -- set the given cell to Live; doesn't refresh the screen
+    toggle(y,x) -- change the given cell from live to dead, or vice
+                   versa, and refresh the screen display
+
+    """
+    def __init__(self, scr, char=ord('*')):
+        """Create a new LifeBoard instance.
+
+        scr -- curses screen object to use for display
+        char -- character used to render live cells (default: '*')
+        """
+        self.state = {}
+        self.scr = scr
+        Y, X = self.scr.getmaxyx()
+        self.X, self.Y = X - 2, Y - 2 - 1
+        self.char = char
+        self.scr.clear()
+
+        # Draw a border around the board
+        border_line = '+' + (self.X * '-') + '+'
+        self.scr.addstr(0, 0, border_line)
+        self.scr.addstr(self.Y + 1, 0, border_line)
+        for y in range(0, self.Y):
+            self.scr.addstr(1 + y, 0, '|')
+            self.scr.addstr(1 + y, self.X + 1, '|')
+        self.scr.refresh()
+
+    def set(self, y, x):
+        """Set a cell to the live state"""
+        if x < 0 or self.X <= x or y < 0 or self.Y <= y:
+            raise ValueError("Coordinates out of range %i,%i" % (y, x))
+        self.state[x, y] = 1
+
+    def toggle(self, y, x):
+        """Toggle a cell's state between live and dead"""
+        if x < 0 or self.X <= x or y < 0 or self.Y <= y:
+            raise ValueError("Coordinates out of range %i,%i" % (y, x))
+        if (x, y) in self.state:
+            del self.state[x, y]
+            self.scr.addch(y + 1, x + 1, ' ')
+        else:
+            self.state[x, y] = 1
+            if curses.has_colors():
+                # Let's pick a random color!
+                self.scr.attrset(curses.color_pair(random.randrange(1, 7)))
+            self.scr.addch(y + 1, x + 1, self.char)
+            self.scr.attrset(0)
+        self.scr.refresh()
+
+    def erase(self):
+        """Clear the entire board and update the board display"""
+        self.state = {}
+        self.display(update_board=False)
+
+    def display(self, update_board=True):
+        """Display the whole board, optionally computing one generation"""
+        M, N = self.X, self.Y
+        if not update_board:
+            for i in range(0, M):
+                for j in range(0, N):
+                    if (i, j) in self.state:
+                        self.scr.addch(j + 1, i + 1, self.char)
+                    else:
+                        self.scr.addch(j + 1, i + 1, ' ')
+            self.scr.refresh()
+            return
+
+        d = {}
+        self.boring = 1
+        for i in range(0, M):
+            L = range(max(0, i - 1), min(M, i + 2))
+            for j in range(0, N):
+                s = 0
+                live = (i, j) in self.state
+                for k in range(max(0, j - 1), min(N, j + 2)):
+                    for l in L:
+                        if (l, k) in self.state:
+                            s += 1
+                s -= live
+                if s == 3:
+                    # Birth
+                    d[i, j] = 1
+                    if curses.has_colors():
+                        # Let's pick a random color!
+                        self.scr.attrset(curses.color_pair(
+                            random.randrange(1, 7)))
+                    self.scr.addch(j + 1, i + 1, self.char)
+                    self.scr.attrset(0)
+                    if not live:
+                        self.boring = 0
+                elif s == 2 and live:
+                    # Survival
+                    d[i, j] = 1
+                elif live:
+                    # Death
+                    self.scr.addch(j + 1, i + 1, ' ')
+                    self.boring = 0
+        self.state = d
+        self.scr.refresh()
+
+    def make_random(self):
+        "Fill the board with a random pattern"
+        self.state = {}
+        for i in range(0, self.X):
+            for j in range(0, self.Y):
+                if random.random() > 0.5:
+                    self.set(j, i)
+
+
+def erase_menu(stdscr, menu_y):
+    "Clear the space where the menu resides"
+    stdscr.move(menu_y, 0)
+    stdscr.clrtoeol()
+    stdscr.move(menu_y + 1, 0)
+    stdscr.clrtoeol()
+
+
+def display_menu(stdscr, menu_y):
+    "Display the menu of possible keystroke commands"
+    erase_menu(stdscr, menu_y)
+
+    # If color, then light the menu up :-)
+    if curses.has_colors():
+        stdscr.attrset(curses.color_pair(1))
+    stdscr.addstr(menu_y, 4,
+        'Use the cursor keys to move, and space or Enter to toggle a cell.')
+    stdscr.addstr(menu_y + 1, 4,
+        'E)rase the board, R)andom fill, S)tep once or C)ontinuously, Q)uit')
+    stdscr.attrset(0)
+
+
+def keyloop(stdscr):
+    # Clear the screen and display the menu of keys
+    stdscr.clear()
+    stdscr_y, stdscr_x = stdscr.getmaxyx()
+    menu_y = (stdscr_y - 3) - 1
+    display_menu(stdscr, menu_y)
+
+    # If color, then initialize the color pairs
+    if curses.has_colors():
+        curses.init_pair(1, curses.COLOR_BLUE, 0)
+        curses.init_pair(2, curses.COLOR_CYAN, 0)
+        curses.init_pair(3, curses.COLOR_GREEN, 0)
+        curses.init_pair(4, curses.COLOR_MAGENTA, 0)
+        curses.init_pair(5, curses.COLOR_RED, 0)
+        curses.init_pair(6, curses.COLOR_YELLOW, 0)
+        curses.init_pair(7, curses.COLOR_WHITE, 0)
+
+    # Set up the mask to listen for mouse events
+    curses.mousemask(curses.BUTTON1_CLICKED)
+
+    # Allocate a subwindow for the Life board and create the board object
+    subwin = stdscr.subwin(stdscr_y - 3, stdscr_x, 0, 0)
+    board = LifeBoard(subwin, char=ord('*'))
+    board.display(update_board=False)
+
+    # xpos, ypos are the cursor's position
+    xpos, ypos = board.X // 2, board.Y // 2
+
+    # Main loop:
+    while True:
+        stdscr.move(1 + ypos, 1 + xpos)   # Move the cursor
+        c = stdscr.getch()                # Get a keystroke
+        if 0 < c < 256:
+            c = chr(c)
+            if c in ' \n':
+                board.toggle(ypos, xpos)
+            elif c in 'Cc':
+                erase_menu(stdscr, menu_y)
+                stdscr.addstr(menu_y, 6, ' Hit any key to stop continuously '
+                              'updating the screen.')
+                stdscr.refresh()
+                # Activate nodelay mode; getch() will return -1
+                # if no keystroke is available, instead of waiting.
+                stdscr.nodelay(1)
+                while True:
+                    c = stdscr.getch()
+                    if c != -1:
+                        break
+                    stdscr.addstr(0, 0, '/')
+                    stdscr.refresh()
+                    board.display()
+                    stdscr.addstr(0, 0, '+')
+                    stdscr.refresh()
+
+                stdscr.nodelay(0)       # Disable nodelay mode
+                display_menu(stdscr, menu_y)
+
+            elif c in 'Ee':
+                board.erase()
+            elif c in 'Qq':
+                break
+            elif c in 'Rr':
+                board.make_random()
+                board.display(update_board=False)
+            elif c in 'Ss':
+                board.display()
+            else:
+                # Ignore incorrect keys
+                pass
+        elif c == curses.KEY_UP and ypos > 0:
+            ypos -= 1
+        elif c == curses.KEY_DOWN and ypos + 1 < board.Y:
+            ypos += 1
+        elif c == curses.KEY_LEFT and xpos > 0:
+            xpos -= 1
+        elif c == curses.KEY_RIGHT and xpos + 1 < board.X:
+            xpos += 1
+        elif c == curses.KEY_MOUSE:
+            mouse_id, mouse_x, mouse_y, mouse_z, button_state = curses.getmouse()
+            if (mouse_x > 0 and mouse_x < board.X + 1 and
+                mouse_y > 0 and mouse_y < board.Y + 1):
+                xpos = mouse_x - 1
+                ypos = mouse_y - 1
+                board.toggle(ypos, xpos)
+            else:
+                # They've clicked outside the board
+                curses.flash()
+        else:
+            # Ignore incorrect keys
+            pass
+
+
+def main(stdscr):
+    keyloop(stdscr)                 # Enter the main loop
+
+if __name__ == '__main__':
+    curses.wrapper(main)