Edit: Python - Going from 1 Player to Two Player Game Using Functions

I posted something similar earlier, but I did a horrible job of asking the right question. I'm trying to code a two player connect four game, but can only manage a 1 player game, with the user playing against the computer. Can anyone help me with trying to write a 2 player approach to the game? I'm still quite a beginner and am still learning the ropes, so apologies if this is still not a good question and/or is too vague.

Here's my current code:

import random

def winner(board):

# Check rows
    for row in range(6):
        for col in range(3):
            if (board[row][col] == board[row][col + 1] == board[row][col + 2] == board[row][col + 3]) and (board[row][col] != " "):
                return board[row][col]

    # Check columns 
    for col in range(6):
        for row in range(3):
            if (board[row][col] == board[row + 1][col] == board[row + 2][col] == board[row + 3][col]) and (board[row][col] != " "):
                return board[row][col]

    # Check diagonal A

    for row in range(3):
        for col in range(4):
            if (board[row][col] == board[row + 1][col + 1] == board[row + 2][col + 2] == board[row + 3][col + 3]) and (board[row][col] != " "):
                return board[row][col]


    # Check diagonal B

    for row in range(5, 2, -1):
        for col in range(3):
            if (board[row][col] == board[row - 1][col + 1] == board[row - 2][col + 2] == board[row - 3][col + 3]) and (board[row][col] != " "):
                return board[row][col]

    # Tie (just returns an empty string)
    return ""

def printBoard(board):
# there are probably better ways to print a board, but I didn"t want to bother with another function, especially since the number of columns and rows are fixed in this game.

    print ("   1   2   3   4    5   6   7")
    print ("1: " + board[0][0] + " | " + board[0][1] + " | " + board[0][2] + " | " + board[0][3] + " | " + board[0][4] + " | " + board[0][5] + " | " + board[0][6] + " | " + board[0][7])
    print ("  ---+---+---+---+---+---+---")
    print ("2: " + board[1][0] + " | " + board[1][1] + " | " + board[1][2] + " | " + board[1][3] + " | " + board[1][4] + " | " + board[1][5] + " | " + board [1][6] + " | " + board [1][7])  
    print ("  ---+---+---+---+---+---+---+")
    print ("3: " + board[2][0] + " | " + board[2][1] + " | " + board[2][2] + " | " + board[2][3] + " | " + board [2][4] + " | " + board [2][5] + " | " + board [2][6] + " | " + board [2][7])
    print ("  ---+---+---+---+---+---+---+")
    print ("4: " + board[3][0] + " | " + board[3][1] + " | " + board[3][2] + " | " + board[3][3] + " | " + board [3][4] + " | " + board [3][5] + " | " + board [3][6] + " | " + board [3][7])
    print ("  ---+---+---+---+---+---+---+")
    print ("5: " + board[4][0] + " | " + board[4][1] + " | " + board[4][2] + " | " + board[4][3] + " | " + board [4][4] + " | " + board [4][5] + " | " + board [4][6] + " | " + board [4][7])
    print ("  ---+---+---+---+---+---+---+")
    print ("6: " + board[5][0] + " | " + board[5][1] + " | " + board[5][2] + " | " + board[5][3] + " | " + board [5][4] + " | " + board [5][5] + " | " + board [5][6] + " | " + board [5][7])
    print

def playerMove(board):

        validMove = False
        while not validMove:
            col = input("What column would you like to play? :")
            for row in range (6,0,-1):
                if (1 <= int(row) <= 6) and (1 <= int(col) <= 7) and (board[int(row)-1][int(col)-1] == " "):
                    board[int(row)-1][int(col)-1] = "X"
                    validMove = True
                    break
            else:
                print ("Invalid input. Please try again!n")

def computerTurn(board):

    validMove = False
    while not validMove:
        row = random.randint(0,5)
        col = random.randint(0,6)
        for row in range (5,0,-1):
            if board[row][col] == " ":
                board[row][col] = "O"
                validMove = True
                break


def game():
    openCells = 42
    playerTurn = True
    count = 1
    newBoard = [ [ " ", " ", " ", " ", " ", " "," ", " "], [ " ", " ", " ", " ", " "," ", " ", " "], [ " ", " ", " ", " ", " ", " ", " ", " "], [ " ", " ", " ", " ", " ", " ", " ", " "], [ " ", " ", " ", " ", " ", " ", " ", " "], [ " ", " ", " ", " ", " ", " ", " ", " "] ]


    while not winner(newBoard) and (openCells > 0):
        printBoard(newBoard)
        if playerTurn:
            playerMove(newBoard)
            playerTurn = not playerTurn
        else:
            computerTurn(newBoard)
            playerTurn = not playerTurn
        openCells -= 1

    printBoard(newBoard)
    if (winner(newBoard) == "X"):
        print ("You Won!")


        print ("nGAME OVER")
    elif (winner(newBoard) == "O"):
        print ("The Computer Won!")
        print ("nGAME OVER")
    else:
        print ("Tie!")
        print ("nGAME OVER n")

EDIT:I modified my code so that I got rid of the computerTurn function and incorporated 2 user inputs in my playerMove function, however my game keeps looping back to player name inputs instead of alternating between turns. Here's the new code (note that only the last couple functions were changed):

def playerMove(board):
    turn = 0
    players = []
    numPlayers = 2
    checkers = ['X','O']
    for i in range(numPlayers):
        players.append(input("Please enter player"+str(i+1)+" name: "))

    validMove = False
    while not validMove:
        col = input(players[turn]+" what column would you like to play? :")
        for row in range (6,0,-1):
            if (1 <= int(row) <= 6) and (1 <= int(col) <= 7) and (board[int(row)-1][int(col)-1] == " "):
                board[int(row)-1][int(col)-1] = "X"
                validMove = True
                break
            else:
                print ("Invalid input. Please try again!n")

def game():
    openCells = 42
    playerTurn = True
    turn = 0
    players = []
    numPlayers = 2
    count = 1
    newBoard = [ [ " ", " ", " ", " ", " ", " "," ", " "], [ " ", " ", " ", " ", " "," ", " ", " "], [ " ", " ", " ", " ", " ", " ", " ", " "], [ " ", " ", " ", " ", " ", " ", " ", " "], [ " ", " ", " ", " ", " ", " ", " ", " "], [ " ", " ", " ", " ", " ", " ", " ", " "] ]


    while not winner(newBoard) and (openCells > 0):
        printBoard(newBoard)
        playerMove(newBoard)
        playerTurn = not playerTurn  
        openCells -= 1

    printBoard(newBoard)
    if (winner(newBoard) == "X"):
        print ("You Won!")


        print ("GAME OVER")
    elif (winner(newBoard) == "O"):
        print ("The Computer Won!")
        print ("GAME OVER")
    else:
        print ("Tie!")
        print ("GAME OVER")


game()