List data types and common operations of python, and list data types of python

List data types and common operations of python, and list data types of python

A list is the most common Python data type. It can appear as a comma-separated value in square brackets.

Each element in the list is assigned a number-its location, or index. The first index is 0, the second index is 1, and so on.

Operations that can be performed on the list include indexing, slicing, adding, multiplication, and checking members. In addition, Python has built-in methods to determine the sequence length and the maximum and minimum elements.

You do not need to create a list of data items of the same type. You only need to enclose different data items separated by commas (,) in square brackets.

As follows:

list1 = ['physics', 'H2O', 1997, 2000]list2 = [1, 2, 3, 4, 5 ]list3 = ["a", "b", "c", "d"]

List slicing:

L [0: 2] Fetch the first to second elements of the list

L [] Fetch the third to fourth elements of the list

L [: 2] Fetch list elements 1, 3, 5 ....

Common Operations of the list are as follows:

Li = ['day', 'Eric ', 'rain']

Calculate the list length and Output

print(len(li))3 

Append the element "seven" to the list"

li.append("seven")

Insert the element "Tony" at the first position in the list"

li.insert(0, "tony")

Modify the element of the 2nd position in the list to "Kelly"

li[1] = "kelly"

Delete the "eric" element from the list"

li.remove("eric")

Delete the 2nd elements in the list

li.pop(1)

Delete 2nd to 4 elements from the list

for i in range(3):     li.pop(1)

Invert all elements in the list

# Method 1li [:-1] # method 2 list (reversed (li ))

Use enumrate to output the list element and serial number (sequence number starts from 100) for the index of the output list using for, len, and range)

for k, v in enumerate(li, 100):     print(k, v)

Use the for loop to output all elements in the list

for i in range(len(li)):     print(i)