Python Learning sharing-list meta-groups

1 lists (list)

The following code assigns a variable to a list

a=['laay','aay','ay','  y']

There are indexes in the list that can be indexed to access the values in the list, or you can complete the slices by indexing

Print (a[0]) Print (a[1]) Print (a[-1]) Print (A[:3]) Print (A[:-1])

The printing results were

laayaayy['laay'aay'ay'  ['laay'aay ' ay ']

Add elements, delete elements, change elements, find elements

A.append ('abc')# add ' abc ' to the last del# of the list Delete element of current index 1 in list a[1]='dd'# Change the list of elements indexed to 1 to ' DD 'print (A[0])# Prints an element with a list index of 0

List of loops

 for inch A:     Print (i)

Other functions of the list

CMP (List1, List2)# compares the elements of the two list to the number of Len (list)# elements and, if the list is empty, can be judged as Faslemax (list)#  Returns the list element maximum min (list)# returns the list element minimum value list (seq)# convert tuples to lists

Other ways to List

List.count (obj)# count the number of occurrences of an element in a list list.extend (seq)#  Append multiple values from another sequence at the end of the list (with a new list)List.index (obj)# Find the index position of the first occurrence of a value from the list List.insert (index, obj)# Inserts an object into the list List.pop (obj=list[-1])# removes an element from the list (the last element by default) and returns the value of the element List.remove (obj)# Removes the first occurrence of a value in the list list.reverse ()# Reverses the element in the list list.sort ([ Func])# sort the original list

Lists can be nested in lists, and lists in lists use logic consistent with general lists

a= [['laay','laa'],'aa','  ay']print(a[0][0])# remove ' laay 'print (a[0][1])# take out ' Laa '

2 tuples (tuple)

Tuples are almost identical to list usages, except that the elements in a tuple cannot be modified, but the tuple itself can be deleted!

A= ('laay','aay','ay','  y')

Python Learning sharing-list meta-groups