python itertools.chain 乘号* 实例

import itertoolsa= ['a','aa','aaa']b= itertools.chain(a)c= itertools.chain(*a)print(a)print(list(b))print(list(c))

print结果
[‘a’, ‘aa’, ‘aaa’]
[‘a’, ‘aa’, ‘aaa’]
[‘a’, ‘a’, ‘a’, ‘a’, ‘a’, ‘a’]