python编程快速上手6.11.1

a = [['apples','oranges','cherries','banana'],
             ['Alice','Bob','Carol','David'],
             ['dogs','cats','moose','goose']]
width = len(a)
height = len(a[0])
for i in range(height):
    for k in range(width):
        if len(a[k][i]) > height:
            rjust = len(a[0])
print(rjust)
for i in range(height):
    for k in range(width):
        print(a[k][i].rjust(rjust), end=" ")
    print()

用pycharm写的一直测试的时候一直运行第一个程序，没有输出，研究了半天给我整笑了，太惨了我，用ctrl +shift +F10运行，可不想出乌龙了，还去问了群友，笑死了。