Python data Structure-List, Tuple, Set, Dict

1. List

How to declare: List = [1,2.3, ' x ', ' Hello '], with method:

• List.append (x) Add an item at the end of the list (append)
• List.extend (L) to extend the current list (extended) with the given list
• List.insert (I,X) Inserts an item at a given position
• List.remove (x) Remove the first item in the list with the value X, Note that X is not an index
• List.pop ([i]) deletes the item at the given position and returns
• List.index (x) returns the index value of the first value of x in the list, with no match resulting in an error
• List.count (x) returns the number of occurrences of x in the list
• List.sort () sort
• List.reserve () Reverse

To iterate through an instance:

numbers = [0,1,2,3,4,5,6,7,8,9]

For I in range (len (numbers)):

Print (Numbers[i])

2, tuple tuple

The Declaration method is very special, tuple = Item1,item2,item3,item4. For example:

tuple = 12,323,4,0,57, ' Hello '

For I in range (len (tuple)):

Print (Tuple[i])

3. Set Set

How to declare: Set = {ITEM1,ITEM2,ITEM3,ITEM4}, for example:

Basket = {' A ', ' B ', ' C ', ' d ', ' e '}

The collection is an unordered set of elements, and the result of the example declaration is:

{' E ', ' C ', ' d ', ' B ', ' A '}

The traversal method is:

For I basket:

Print (i)

4. Dictionary Dict

Declaration Example: tel = {' Jack ': 23432, ' scape ': 234}

The following methods can be used to assign values: tel[' chunyu '] = 19910805

The result is: {' Chunyu ': 19910805, ' Jack ': 23432, ' scape ': 234}

You can use the items () method to get the keys and corresponding values, for example:

For k,v in Tel.items ():

Print (K,V)

The traversal method is:

Tel = {' Chunyu ': 19910805, ' Jack ': 23432, ' scape ': 234}

For key in Tel:

Print (Key, ': ', Tel[key])

Python data Structure-List, Tuple, Set, Dict