Add training code samples

Author: georgeyk

training/README.md

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+# Training
+
+Traning code examples.
+It should not depend on external libraries.
+
+* Python 3.7+ (but older versions should be fine)

training/game_of_life.py

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+# -*- coding: utf-8 -*-
+# vi:si:et:sw=4:sts=4:ts=4
+
+# https://en.wikipedia.org/wiki/Conway%27s_Game_of_Life
+
+import random
+import time
+import sys
+
+
+def create_grid(n):
+    grid = []
+    for i in range(n):
+        grid.append([bool(random.randint(0, 1)) for col in range(n)])
+
+    return grid
+
+
+def display(grid, generation):
+    # clear screen
+    print(chr(27) + "[2J")
+
+    state = ""
+    for row in grid:
+        for value in row:
+            state += "⬛️" if value else "⬜️"
+
+        state += "\n"
+
+    state += "\nGeneration: {}".format(generation)
+    print(state)
+
+
+def count_alive_neighbours(grid, row, column):
+    order = len(grid)
+    count = 0
+    for x in (row - 1, row, row + 1):
+        for y in (column - 1, column, column + 1):
+            if x == row and y == column:
+                continue
+
+            if x >= 0 and x < order and y >= 0 and y < order:
+                count += 1 if grid[x][y] else 0
+
+    return count
+
+
+def calculate_next_generation(grid):
+    next_gen_states = []
+    for i, row in enumerate(grid):
+        for j, value in enumerate(row):
+            alive = count_alive_neighbours(grid, i, j)
+            if value:
+                if alive < 2 or alive > 3:
+                    next_gen_states.append((i, j, False))
+            else:
+                if alive == 3:
+                    next_gen_states.append((i, j, True))
+
+    return next_gen_states
+
+
+def create_generations(grid_size, generations, interval=0.2):
+    grid = create_grid(grid_size)
+    for i in range(generations):
+        next_generation_states = calculate_next_generation(grid)
+
+        if not next_generation_states:
+            break
+
+        for row, col, value in next_generation_states:
+            grid[row][col] = value
+
+        display(grid, i)
+        time.sleep(interval)
+
+
+if __name__ == "__main__":
+    try:
+        create_generations(grid_size=20, generations=1000)
+    except KeyboardInterrupt:
+        print("\nbye!")
+        sys.exit(1)
+    else:
+        sys.exit(0)