3.4 List list []
Format of the list
lst_l = [1,'123',[1,'www',2],'包青天']There is also a list of index
print(lst_l[0])
print([-1][0:2]) #包青
# Slice or a slice out of the list
print(lst[1:3])
print(lst[start:end:步长]) #开始:结束:步长List of additions and deletions to change search
list and str is not the same list of changes can occur
increase
1. Adding .append
lst[]
lst.append('要增加的内容') #.append (在最后增加)2. Insert .insert
lst=['刘德华','古天乐','张家辉']
lst.insert(2,'陈小春') #在第二个位置插入陈小春 插在你定位的索引之前3. Add .extend iteration
lst=['李文浩','浩文李']
lst.extend(['刘能','赵四'])
lst.extend('刘能`')4. list merge
l1=[1,2,3]
l2=['ww','www']
l3= l1+l2
print(l3)[1,2,3,'ww','www']delete
Except pop return value returned is removed elements
1 .pop () to delete the last, you can also delete according to index
1st = ['a','b','古天乐']
s1 =lst.pop() #默认删除最后一个,删除古天乐
s1 =lst.pop(2) #按照索引去删除2.remove () to delete pressing element
lst.remove('a') #按照元素去删除3.clear () Clear List
lst = ['语文','数学','英语']
lst.clear #清空列表
print(lst) 4.del lst [2] index delete del lst [:: 2] sections deleted
del lst[0:2] #切片去删除
del lst #将整个列表删除change
1. The index change directly to
lst = ['大话西游','功夫']
lst[1] = '美人鱼'The index sliced into iterative modification #
lst[0:2]=['无间道']3. step - you take a few, not to put a few more, no less
check
Iterable list is a for loop to iterate him
for i in lst:
print(i)Related operations
| method | meaning | Remark |
|---|---|---|
| .count('') | count | list.count ( 'the content to be counted') |
| .sort() | Sequence | the list.sort () Default positive sequence ordering list.sort ( 'reverse = True') # flashback |
| .reverse() | Overturn | list.reverse () Flip a whole |
| len (list) | Seek length | len (list) |
Nested list
list = [1,2,['古天乐','李文浩'],1]
list = [2][0] #古天乐