# Connect Four¶

Connect Four, two-player connection game.

```"""Connect Four

Exercises

1. Change the colors.
2. Draw squares instead of circles for open spaces.
3. Add logic to detect a full row.
4. Create a random computer player.
5. How would you detect a winner?

"""

from turtle import *

from freegames import line

turns = {'red': 'yellow', 'yellow': 'red'}
state = {'player': 'yellow', 'rows':  * 8}

def grid():
"Draw Connect Four grid."
bgcolor('light blue')

for x in range(-150, 200, 50):
line(x, -200, x, 200)

for x in range(-175, 200, 50):
for y in range(-175, 200, 50):
up()
goto(x, y)
dot(40, 'white')

update()

def tap(x, y):
"Draw red or yellow circle in tapped row."
player = state['player']
rows = state['rows']

row = int((x + 200) // 50)
count = rows[row]

x = ((x + 200) // 50) * 50 - 200 + 25
y = count * 50 - 200 + 25

up()
goto(x, y)
dot(40, player)
update()

rows[row] = count + 1
state['player'] = turns[player]

setup(420, 420, 370, 0)
hideturtle()
tracer(False)
grid()
onscreenclick(tap)
done()
```