word=['a','b','c','d','e','f','g']
l=len(word)
print ("a:"+word[2])
word.append('h')
print (word)
输出:a:c
['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h']
l=len(word)
print ("a:"+word[2])
word.append('h')
print (word)
输出:a:c
['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h']