Python fifth day

Lists List

Add Append

A = ['shangsan','Lisi']a.append ('  Wangwu')  ## #wangwu增加到尾部

Insert insertion (by index)

A = ['b','C']a.insert (1,'d'   # ## # #d插入到列表1的位置The result is: ['b','D  ','C']

Addition of Extend iterations

A = ['a','b','C']a.extend ('MNL') The result is: ['a','b','C','m','N','L']

Deletion of the list

Pop is deleted by index and has a return value

A = ['a','b','c',' D ' ]a.pop (2) The result is ['a','b', ' D ']

Remove removes elements directly

A = ['a','b','C']m.remove (  'a')

Del Delete by index can be sliced delete

A = ['a','b','c',' D ' ]del a[0:1]

Clear Empty List

Changes to the list

Delete First, iterate to add

Direct assignment according to the index

A = ['a','b','C'  D' result is ['d','b ','C']

Count List counts

Sort (list is ordered and can be sorted by index)

Sort positive Order

A = [1,5,8,4,6,3,4]a.sort ()print(a)  ## #按照大小顺序

Reverse reverse (reverse, from rear to front)

Reverse (in order) A.sort (rever=true)

The list is converted into a string join

A = ['a','b','C']  Print('*'. Join (a))  ### ' * ' delimiter

The result is: a*b*c

Python fifth day