Python list (List)

Python sequence is the most basic data structure. Each element in the sequence is assigned a number - its position, or index, the first index is 0, the second index is 1, and so on.

Python has a built-in types 6 sequence, but the most common are lists and tuples.

Sequence of operations can be carried out, including indexing, slicing, add, multiply, check the members.

Moreover, Python has a built-determine the length of the sequence and determining the maximum and minimum element method.

Python is a list of the most commonly used type of data, it can be used as a comma-separated values ​​appear in square brackets.

List of data items need not have the same type

Create a list as long as the comma-delimited data items using different brackets can be. As follows:

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

With the index of the string as a list of index starts from 0. List can be intercepted, combinations and the like.

Access list value

Use subscripting to access values ​​in the list, you can also use square brackets in the form of interception of character, as follows:

#!/usr/bin/python

list1 = ['physics', 'chemistry', 1997, 2000];
list2 = [1, 2, 3, 4, 5, 6, 7 ];

print "list1[0]: ", list1[0]
print "list2[1:5]: ", list2[1:5]

Examples of the above output:

list1[0]:  physics
list2[1:5]:  [2, 3, 4, 5]

update list

#!/usr/bin/python

list = ['physics', 'chemistry', 1997, 2000];

print "Value available at index 2 : "
print list[2];
list[2] = 2001;
print "New value available at index 2 : "
print list[2];

We will discuss the use of the next chapter in the append () method: Note

Examples of the above output:

Value available at index 2 :
1997
New value available at index 2 :
2001

Remove list element

You can use the del statement to remove elements of the list, the following examples:

#!/usr/bin/python

list1 = ['physics', 'chemistry', 1997, 2000];

print list1;
del list1[2];
print "After deleting value at index 2 : "
print list1;

Examples of the above output:

['physics', 'chemistry', 1997, 2000]
After deleting value at index 2 :
['physics', 'chemistry', 2000]

We will discuss the use of the next chapter in the remove () method: Note

Python script list operator

List of + and * operators and string similarity. + Sign for the combined list, an asterisk for the repeat list.

As follows:

Python list interception

Python list interception string type of operation, as follows:

L = ['spam', 'Spam', 'SPAM!']

operating:

Python list of functions & methods

Python includes the following functions:

Python includes the following methods: