connect4.py

#!/bin/python3
import turtle
import time

circles = []
circles_per_row = 7

player_number = 1
player_colour = 'red'
game_won = False

def make_grid():

  startx = -150
  starty = 150

  distance_between_circles = 40
  circle_counter = 0

  for i in range(1, 43):
    new_circle = turtle.Turtle()
    new_circle.shape('circle')
    new_circle.speed('fastest')
    new_circle.hideturtle()
    new_circle.penup()
  
    if circle_counter >= circles_per_row:
      starty = starty - 40
      startx = -150
      circle_counter = 0
    
    new_circle.setx(startx)
    new_circle.sety(starty)
  
    startx = startx + distance_between_circles
  
    circles.append(new_circle)
    circle_counter = circle_counter + 1
# end of make_grid function

def make_case():
  case = turtle.Turtle()
  case.color('black')
  case.speed('fastest')
  case.penup()
  case.setx(-170)
  case.sety(170)
  case.pendown()
  
  for i in range(0, 2):
    case.forward(280)
    case.right(90)
    case.forward(250)
    case.right(90)
  
  for i in range(0, 6):
    case.forward(40)
    case.right(90)
    case.forward(250)
    case.penup()
    case.back(250)
    case.left(90)
    case.pendown()
    
  case.forward(40)
  case.right(90)
  
  for i in range(0, 5):
    case.forward(41)
    case.right(90)
    case.forward(280)
    case.back(280)
    case.left(90)
# end of make_case function

def put_chip_in_slot(slot):
  print("Putting chip in slot: "+str(slot))

  row = 0
  another_row = True
  while (another_row):

    circle_number = (row*circles_per_row) + slot
    circle = circles[circle_number]

    # Is the slot taken?
    if (circle.isvisible()):
      another_row = False
      return
    # Is there another row and is the slot taken?
    else:
      if (((circle_number + circles_per_row) <= len(circles)) and not circles[circle_number + circles_per_row].isvisible()):
        row = row + 1
      else:
        another_row = False
  
  circle.color(player_colour)
  circle.showturtle()

# end of put_chip_in_slot function

# Game code
make_grid()
make_case()
print("The game is ready to play!")

while (not game_won):
  
  print("Player "+str(player_number)+" to play")
  print("Enter a slot between 0-6")
  slot = int(input())
  put_chip_in_slot(slot)
  
  if (player_number == 1):
    player_number = 2
    player_colour = 'green'
  else:
    player_number = 1
    player_colour = 'red'