python list syntax learning

Create: list = [5,7,9]
Value and change: list[1] = list[1] * 5
Insert at the end of the list: list.append(4)
Remove the 0th value and return the value of the 0th value: list.pop(0)
Remove the 0th value but not return the value: del(list[0])
Remove a specific value: list .remove(35)

Function function:
No parameters: def function():
One parameter: def function(x):
2 parameters: def function(y):
Any number of parameters: def add_function(*args):

Function range:
One parameter: range(n) Counting n digits starting from digit 0
Two parameters: range (m,n) Starting from the mth position to the n-1th position, the increment interval is 1
Three parameters: range(m,n,i) Starting from the mth position to the n-1th position, the incrementing interval For i
for item in list: and for i in range(len(list)): Equivalent

Use separator as the interval output for the elements in the list: print separator.join(list)
For example: list = ['a','b','c','d'] A general print list will output: ['a','b','c','d'].
And print " ".join(list) will output: a b c d (must be double double quotes, single double quotes will not work)

Accept keyboard input:
guess_row = int(raw_input ("Guess Row:"))

The following is a small program I wrote: generate a square matrix and a random position, and ask the player to guess where the generated position is

from random import randint
def creat_board(length):
    board = []
    for i in range(length):
        board.append(['O'] * length)
    return board
def print_board(x):
    for row in x:
        print " ".join(row)
def random_row(board):
    return randint(0, len(board) - 1)

def random_col(board):
    return randint(0,len(board[0]) - 1)

length = int(raw_input("Enter board's length you:"))
board = creat_board(length)
print_board(board)
turns = int(raw_input("Enter turns you want to play:"))
for turn in range(turns):
    ship_row = random_row(board)
    ship_col = random_col(board)
    print "This is " + str(turn + 1) + "th time to guess:"
    guess_row = int(raw_input("Enter the row you guess:"))
    guess_col = int(raw_input("Enter the col you guess:"))

    if guess_row == ship_row and guess_col == ship_col:
        print "You win!"
        break
    else:
        if (guess_row < 0 or guess_row > len(board) - 1) or (guess_col < 0 or guess_col > len(board) - 1):
            print "Incorrect input!"
            if turn == turns - 1:
                print "Turns out!"
        elif board[guess_row][guess_col] == &#39;X&#39;:
            print "You have guessed it already!"
            if turn == turns - 1:
                print "Turns out!"
        else:
            print "You guess wrong!"
            board[guess_row][guess_col] = &#39;X&#39;
            print_board(board)
            if turn == turns - 1:
                print "Turns out!"

Once committed Errors:
1. The board creation function forgot to return a board, so it was always empty, causing subsequent operations to go out of bounds;
2. When generating random positions, the naming of the position row and col always followed The generated function names are the same (random_row=random_row(board)), resulting in TypeError: 'int' object is not callable error.

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