simple GUI snake game

90's most played mobile game i.e Snake game using Tkinter python for beginners also very easy to understand! 
Its fun to create and also to play!
you will learn how logic is applied in coding, and also very easy to learn python

Author: KrunalKharat02

SNAKE/snake_game.py

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+import turtle as t
+import random
+ 
+w = 500 # Width of box
+h = 500 # Height of box
+food_size = 10 # Size of food
+delay = 100 # in millisecond
+
+# Values by which snake will move in direction when given direction
+offsets = {
+    "up": (0, 20),
+    "down": (0,-20),
+    "left": (-20,0),
+    "right": (20,0)
+}
+
+global SCORE
+SCORE = 0
+# Default postion of game scene
+
+def reset():
+    global snake, snake_dir, food_position, pen
+ 
+    snake = [[0,0],[0,20],[0,40],[0,60],[0,80]]
+    snake_dir = "up" #default snake direction
+    food_position = get_random_food_position()
+    food.goto(food_position) # render food on scene
+    move_snake()
+
+def move_snake():
+    global snake_dir,SCORE
+ 
+    new_head = snake[-1].copy()
+    new_head[0] = snake[-1][0] + offsets[snake_dir][0]
+    new_head[1] = snake[-1][1] + offsets[snake_dir][1]
+    
+    if new_head in snake[:-1]:
+        print(SCORE)
+        reset()
+    else:
+        snake.append(new_head)
+ 
+     
+        if not food_collision():
+            snake.pop(0)
+ 
+        if snake[-1][0] > w / 2:
+            snake[-1][0] -= w
+        elif snake[-1][0] < - w / 2:
+            snake[-1][0] += w
+        elif snake[-1][1] > h / 2:
+            snake[-1][1] -= h
+        elif snake[-1][1] < -h / 2:
+            snake[-1][1] += h
+
+        pen.clearstamps()
+      
+        for segment in snake:
+            pen.goto(segment[0], segment[1])
+            pen.stamp()
+       
+        screen.update() 
+        t.ontimer(move_snake, delay)
+ 
+# If snake collides with food
+def food_collision():
+    global food_position, SCORE
+    if get_distance(snake[-1], food_position) < 20:
+        SCORE += 10
+        food_position = get_random_food_position()
+        food.goto(food_position)
+        return True
+    return False
+ 
+# Random position for food
+def get_random_food_position():
+    x = random.randint(- w / 2 + food_size, w / 2 - food_size)
+    y = random.randint(- h / 2 + food_size, h / 2 - food_size)
+    return (x, y)
+ 
+
+def get_distance(pos1, pos2):
+    x1, y1 = pos1
+    x2, y2 = pos2
+    distance = ((y2 - y1) ** 2 + (x2 - x1) ** 2) ** 0.5
+    return distance
+  
+# Control
+def go_up():
+    global snake_dir
+    if snake_dir != "down":
+        snake_dir = "up"
+def go_down():
+    global snake_dir
+    if snake_dir != "up":
+        snake_dir = "down"
+def go_left():
+    global snake_dir
+    if snake_dir != "right":
+        snake_dir = "left"
+def go_right():
+    global snake_dir
+    if snake_dir != "left":
+        snake_dir = "right"
+
+#define screen setup
+screen = t.Screen()
+screen.setup(w, h)
+screen.title("Snake Game")
+screen.bgcolor("lightgrey")
+screen.tracer(0)
+
+#define snake setup
+pen = t.Turtle("square")
+pen.penup()
+
+#define food setup
+food = t.Turtle()
+food.shape("circle")
+food.color("red")
+food.shapesize(food_size / 20)
+food.penup()
+
+#define control setup
+screen.listen()
+screen.onkey(go_up, "Up")
+screen.onkey(go_right, "Right")
+screen.onkey(go_down, "Down")
+screen.onkey(go_left, "Left")
+
+reset()
+t.done()