[Python] I have made a Tic Tac Toe game but it shows the wrong player when someone has won

I have made a Tic Tac Toe game in python and when X wins it shoes that O has won and when O wins it shows that X has won. I am pretty sure that the problem is that it changes player and after that checks if someone has won, I tried making it so it will switch be before the player switch but it still didn't work. I also tried to change player in the is_win function but that also didn't fix it. Could someone please take a look at this and help me fix this.

initial_board = [['_', '_', '_'], ['_', '_', '_'], ['_', '_', '_']]
board = initial_board
def empty_board(): #use board = empty_board() everytime you want to empty the board
board = [['_', '_', '_'], ['_', '_', '_'], ['_', '_', '_']]
return(board)
def switch_turn(player): #use player = switch_turn(player) everytime you want to switch players
if player == 'X':
return 'O'
return 'X'
def print_board(board):
print(*board, sep = "\n")
def is_full(board):
return all('_' not in box for box in board)
def is_valid(board, row, col):
x = board[row]
if x[col] == '_':
return True
return False
def set_cell(board, row, col, player):
x = board[row]
if is_valid(board,row,col) is True:
x[col] = player
print_board(board)
else:
print("already taken")
def get_user_input():
while True:
while True:
row = int(input("Enter the row you want (0-2): "))
if row > 2 or row < 0:
print("The number you entered is not valid")
continue
break
while True:
col = int(input("Enter the column you want (0-2): "))
if col > 2 or col < 0:
print("The number you entered is not valid")
continue
break
if is_valid(board,row,col) is True:
return row,col
else:
print("This place is taken")
continue
def is_win(board,player):
row1 = board[0]
row2 = board[1]
row3 = board[2]
if row1[0] == row1[1] == row1[2] != '_':
print(player + " Has won!")
return True
elif row2[0] == row2[1] == row2[2] != '_':
print(player + " Has won!")
return True
elif row3[0] == row3[1] == row3[2] != '_':
print(player + " Has won!")
return True
elif row1[0] == row2[0] == row3[0] != '_':
print(player + " Has won!")
return True
elif row1[1] == row2[1] == row3[1] != '_':
print(player + " Has won!")
return True
elif row1[2] == row2[2] == row3[2] != '_':
print(player + " Has won!")
return True
elif row1[0] == row2[1] == row3[2] != '_':
print(player + " Has won!")
return True
elif row1[2] == row2[1] == row3[0] != '_':
print(player + " Has won!")
return True
else:
return False
def game():
player = 'X'
print_board(board)
while is_win(board, player) is False:
if is_full(board) is True and is_win(board, player) is False:
print("draw")
break
elif is_full(board) is True and is_win(board, player) is True:
print(is_win(board, player))
break
row, col = get_user_input()
set_cell(board, row, col, player)
player = switch_turn(player)
game()

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