List and Ganso of the Python series

Container:

List and Ganso

Difference:

The list can be modified, and the meta-ancestor cannot

Sequence: List, Ganso (each element in the sequence has its own ID (number), numbering starts from 0 to the right)

Common:

Index:

Eg:name= ' Jack ', name[0]= ' J '

Note: You can also direct ' Jack ' [0]= ' J '

Sharding:

Provides two indexes as a boundary, the element of the first index is contained within the Shard, and the second is not contained within the Shard.

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

Shortcut: numbers[:] is equal to the entire sequence

Step: eg:numbers[0:5:2]=[0,2,4], where the step size is set to 2

Note: For a positive step, Python extracts the element to the right from the head of the sequence until the last element, and for a negative step, the

The tail of the sequence begins to extract elements to the left until the first element

Addition:

Note: Only two sequences of the same type can be connected.

eg:[1,2,3]+[4,5,6] = [1,2,3,4,5,6]

' Hello, ' + ' Python ' = ' Hello,python '

error:[1,2,3]+ ' Hello ' (Error)

Multiplication:

Multiplying the number x by a sequence creates a new sequence, and in the new sequence, the original sequence is repeated x times.

eg: ' Hello ' *3= ' Hellohellohello '

Membership:

In order to check whether a value is in a sequence, you can use the In operator to return a value of true or false.

eg:permission= ' rwx '

' R ' in permission, returns True

Characteristics:

Change the list:

Eg:data = [1,1,1,1,1]

data[1]=2, this sentence changes the list, changing the list to [1,2,1,1,1]

Del Data[2], remove the 3rd element of the list, and change the list to [1,2,1,1]

Map: Dictionary (each element in the map has its own key)

Collection:

List and Ganso of the Python series