list = ['','','','','','','','','','','','','','','']
list_2 = ['']*15
list_3 = ['' for i in range(15)]
print(list)
print(list_2)
print(list_3)


str = 'XXXXX'
print(str)


for i in range(10):
    print(i)


def foo(x,y):
    print('两数之和为{}'.format(x+y))

foo(10,11)


board = [[' ']*15 for line in range(15)]


list_4 = ['X','X','O','O']
list_str = ''.join(list_4)
print(list_str)


line = ['O','O','O','O','O']
line_2 = ['O','O','O','O','X']
print('line转化为字符串：',''.join(line))
print('line_2转化为字符串：',''.join(line_2))
print('查找line是否有5个O：',''.join(line).find('O'*5))
print('查找line_2是否有5个O：',''.join(line_2).find('O'*5))

def set_chess(x,y,color):
    if board[x][y] != ' ':
        print('该位置已有棋子')
        return False
    else:
        board[x][y] = color
        return True