Tic Tac Toe game in Python

This is not a true game, nor either a simulation, but a casual game in the sense that there is no AI in this, but just casual choices, like when players have no strategy at all in the game of the tic tac toe.

It is just an exercize to take confidence with some strategy you could adopt doing a game.
The code is so simple. Very basic. No graphic. It simply displays all the moves (casual moves) of the two players on a grid made by number from 0 to 8.


Let's take a look at the code and the output

from random import shuffle

gr = '012345678'
end = False

print("Let's start...")

def show():
 x = 0
 for i in gr:
  if end == True:
   break
  if x > 2:
   x = 0
   print()
  print(i,end=' ')
  x += 1
 print()
 print()


print()

lgr = list(gr)
shuffle(lgr)

def randomx(x):
 for i in range(x):
  global gr
  pick = lgr.pop()
  gr = gr.replace(pick,"X")
  show()
  pick = lgr.pop()
  gr = gr.replace(pick,"O")
  show()
  allrow()


def rows(*args):
 row = ''
 for i in args:
  row += gr[i]
 return row

def allrow():
 global end
 w = "XXX"
 o = "OOO"
 r1 = rows(0,1,2)
 r2 = rows(3,4,5)
 r3 = rows(6,7,8)
 c1 = rows(0,3,6)
 c2 = rows(1,4,7)
 c3 = rows(2,6,8)
 d1 = rows(0,4,8)
 d2 = rows(2,4,6)

 r = (r1,r2,r3,c1,c2,c3,d1,d2)
 if w in r:
  print("X is the winner")
  end = True
 elif o in r:
  print("O is the winner")
  end = True
 else:
  print("The game goes on\n")
  if len(lgr)>1:
   randomx(1)

allrow()

Let's start...

The game goes on

0 1 2 
X 4 5 
6 7 8 

0 1 2 
X O 5 
6 7 8 

The game goes on

X 1 2 
X O 5 
6 7 8 

X 1 O 
X O 5 
6 7 8 

The game goes on

X 1 O 
X O 5 
6 7 X 

X 1 O 
X O 5 
O 7 X 

Ha vinto lo O

1. showing the grid

from random import shuffle

gr = '012345678'
end = False

print("Let's start...")

def show():
 x = 0
 for i in gr:
  if end == True:
   break
  if x > 2:
   x = 0
   print()
  print(i,end=' ')
  x += 1
 print()
 print()

I imported the shuffle function from the random module.
The I used the string gr for the grid.
In the function show, in fact, I cicled the string with a for loop that printed in the console three caracters, then use print() to go to the next line and then goes on untile the end. At the end it prints a couple of empty line to give space to text in the console output.

2. Casual playing
As I said, the choises of the players are random. I transformed the string '12345678' in al list (lgr). Then I shuffled the list (I could not shuffle the string, because strings are immutable objects in Python).
Then I made the random() function. This has a for loop that is not useful... I made it for other purposes that in the final version in no more necessary, but I left here... it should be deleted... but let's fake is not there. When you call the function the last of the items of the list is picked. It is a casual string... that contains a number... it is casual because I shuffled the lgr list.
I replace the number in gr string ("012345678") with an "X". So now the gr string has been changed in ("01X345678") if the struing with a numer randomly chosen from lgr was "2". As I have popped the element from the list lgr, that element is no more in the list.
 Then I show the grid with the show() function, the I choose randomly where to put the "O" as it was done for the "X".

lgr = list(gr)
shuffle(lgr)

def randomx(x):
 for i in range(x):
  global gr
  pick = lgr.pop()
  gr = gr.replace(pick,"X")
  show()
  pick = lgr.pop()
  gr = gr.replace(pick,"O")
  show()
  allrow()

In the next episode we will explain the rest of the code.