The fourth day of the snow Python

List of additions and deletions to increase the search

. append () add element to list last

Li = ['Alex','wusir','Egon', ' Goddess ','taibai']li.append ('123')  ) Print (LI)

. Insert () to insert an element at a specified location

Li = ['Alex','wusir','Egon', ' Goddess ','taibai']li.insert (2,'the '  ) Print (LI)

. Extend () can iterate inserts, int is not iterative, each object that can iterate is added to the list as an element

Li = ['Alex','wusir','Egon', ' Goddess ','taibai']li.extend ('123456  ') print (LI)

By deleting

. Pop () can delete the element at the specified position, delete by index, delete the last one by default, have a return

Li = ['Alex','wusir','Egon', ' Goddess ','taibai']li.remove ('Alex'  ) Print (LI)

. Remove () deletes the specified element by element

Li = ['Alex','wusir','Egon', ' Goddess ','taibai']li.remove ('Alex'  ) Print (LI)

Del li Delete list

Li = ['Alex','wusir','Egon', ' Goddess ','taibai']del  liprint (LI)

Del li[x:y] Slice Delete, you can delete the elements of the slice area

Li = ['Alex','wusir','Egon', ' Goddess ','taibai']del li[2:]print (LI)

Change

Li[x:y] = ' xxxxxx ' reassign the specified element, delete by index and delete by slice, assignment is processed iteratively, and several elements are formed by typing

Li = ['Alex','wusir','Egon', ' Goddess ','taibai'ABC '  Print (LI)

Check

For I in Li:

Print (i) all elements in the output list

Print (Li[0:2]) outputs the elements of the slice area as a list

Li = ['Alex','wusir','Egon', ' Goddess ','taibai'] for in Li:     Print(i)print(Li[0:2])

Public methods

Len () calculates the length

s = (2,5,6,4,8,1,3,9,7= len (s) print (L)

Count () calculates the number of occurrences of an element

Li = ('granddarkness ')= Li.count ('a') print (s)

Index () queries the location of an element

Li = ('granddarkness ')= Li.index ('a') print (s)

Sort

. Sort () to sort numbers by size, from small to large, fastest and most efficient

Li = [5,3,7,9,1,6,4,8,2]li.sort ()print(LI)

. Sort (reverse=true) from large to small

Li = [5,3,7,9,1,6,4,8,2]li.sort (Reverse=True)print(LI)

. Reverse reverses the list element output

Li = [5,3,7,9,1,6,4,8,2]li.reverse ()print(LI)

List of nested meta-ancestors Tupe read-only list

As the name implies is a list that can only be read, its subclasses do not allow any changes, but the subclasses of the list in its subclasses may be able to change

The. Join () object is an iterative object, the return value is a string, the list is converted to a string, and all the elements in the list are stitched together

' ABCDE '  ='%'. Join (s)print(S1)

Range () outputs the number of its specified interval, which can be customized to the end and step, following the Gu Tou disregard principle

 for  in range (0,100,1):    print(i)

The fourth day of the snow Python