Python Learning---data type---list

Python Learning

1. List []

1.1) A list is a data structure that handles a set of ordered items, that is, you can store a sequence of items in a list.

1.2) variable data type when listing

1.3) The list consists of a list of [] labels with multiple comma-separated numbers or strings

Example: list[1,2,3] list1['aaa', 123,'qwsx ']

Empty list list[]

Note: When you define a tuple with only one value, add a comma after it, and the list has only one value without adding any symbols

2. Operation of the list

2.1) Re-assignment of the list (in list1["Qaz", "Qwedc"])

list1[0]="aaa" view List1 's ID did not find a change.

2.2) Add a value to the list

List1.append ("123456") eg: adding data by Append method

2.3) Delete a value from the list:

List1.remove (list1[3]) or list1.remove["123456"] The latter removes the first occurrence of the value

Delete entire list: Del (list1[])

2.4) Helpful: Help (list.)

3. Quick start for objects and classes

3.1 Object = attribute + method

A list is a class, and the list1 we define ourselves is an object of the list. This object has append, Del,remove and other methods.

Python Learning---data type---list