insert: It takes two arguments, and insert the one element into the desired position. Note: index -1 will insert into last two position of the list, if you want to insert to end of list, please use len().
>>> a = [1,2,3] >>> a.insert(0,4) >>> a [4, 1, 2, 3] >>> a.insert(-1,5) >>> a [4, 1, 2, 5, 3] >>> a.insert(len(a),6) >>> a [4, 1, 2, 5, 3, 6]
Append: it can append one element or multiple elemenets.
>>> a = ['a','b','c'] >>> b, c = ['d'], ['e','f'] >>> a.append(b) >>> a ['a', 'b', 'c', ['d']] >>> a.append(c) >>> a ['a', 'b', 'c', ['d'], ['e', 'f']]
extend: it extends current list without addint sub list
>>> a = ['a','b','c'] >>> b, c = ['d'], ['e','f'] >>> a.extend(b) >>> a ['a', 'b', 'c', 'd'] >>> a.extend(c) >>> a ['a', 'b', 'c', 'd', 'e', 'f']
发表评论