《Python编程快速上手—让繁琐工作自动化》第4章实践项目答案

4.10.1 逗号代码

def douhao(arg):
    return ', '.join(arg[:-1]) + ' and ' + arg[-1]


spam = ['apples', 'bananas', 'tofu', 'cats']
print(douhao(spam))

程序运行结果

apples, bananas, tofu and cats

Process finished with exit code 0

4.10.2 字符图网格

# 打印矩阵grid的转置矩阵

grid = [['.', '.', '.', '.', '.', '.'],
        ['.', '0', '0', '.', '.', '.'],
        ['0', '0', '0', '0', '.', '.'],
        ['0', '0', '0', '0', '0', '.'],
        ['.', '0', '0', '0', '0', '0'],
        ['0', '0', '0', '0', '0', '.'],
        ['0', '0', '0', '0', '.', '.'],
        ['.', '0', '0', '.', '.', '.'],
        ['.', '.', '.', '.', '.', '.']]

for x in range(0, len(grid[0])):
    for y in range(0, len(grid)):
        print(grid[y][x], end=' ')
    print('')

程序运行结果

. . 0 0 . 0 0 . . 
. 0 0 0 0 0 0 0 . 
. 0 0 0 0 0 0 0 . 
. . 0 0 0 0 0 . . 
. . . 0 0 0 . . . 
. . . . 0 . . . . 

Process finished with exit code 0