打印下列图形
ABCDEFG
GABCDEF
FGABCDE
EFGABCD
DEFGABC
CDEFGAB
BCDEFGA
word = list('ABCDEFG') * 2
for i in range(7, 0, -1):
print(''.join(word[i:i+7]))
word = 'ABCDEFG' * 2
for i in range(7, 0, -1):
print(word[i:i+7])
s='ABCDEFG'
for i in range(7):
print(s)
s=s[-1]+s[0:-1]