Beginners Learn python (one) list basic operations

Want to write something to the process of learning Python to record, so there is a rookie learn python ...

List lists are often used in writing programs, and are data structures used to process a set of ordered items.

For example, range (1,5) is actually a list of integers

So

For x in range (1,5)

can be written

For x in [1,2,3,4]

Here are some common basic operations for lists

Create a list of empty lists first

list = []

Add a value to this list with append

List.append (1)                     #向list里面添加1

You can add multiple values to the middle of a list by extend

List.extend ([2,3,4,5,6])            #向list中一次性添加2, 3,4,5,6

You can remove a known value from the list by removing

List.remove (6)                #将list中的6删除

If I want to access a value in the list, I need to know his location, and the values in the list have an attribute that can be understood as the position number, starting with 0

For example, in the list I want to know what the 2nd value is, just need

LIST[1]

Known location, you can also modify the value to modify the first value in the list to ' Frist '

List[0] = ' frist '

can be removed to remove the frist that was just inserted

Del List[0]

Can insert data, insert ' 0 ' in the first position

List.insert (0, ' 0 ')

If you only know what the value is, you need index ()

List.index (3) List.index (4)

Beginners Learn python (one) list basic operations