{"id":3756,"date":"2017-09-24T06:03:50","date_gmt":"2017-09-24T06:03:50","guid":{"rendered":"http:\/\/www.jquery-az.com\/?p=3756"},"modified":"2023-11-01T16:26:43","modified_gmt":"2023-11-01T16:26:43","slug":"2-waystricks-reverse-python-list-items-4-examples","status":"publish","type":"post","link":"https:\/\/www.jquery-az.com\/2-waystricks-reverse-python-list-items-4-examples\/","title":{"rendered":"How to Reverse Python List?"},"content":{"rendered":"

\"Infographic:<\/p>\n

The items in a list of Python can be reversed in different ways, as described below.<\/p>\n

First way – using the reverse method of the list<\/h3>\n

You may reverse a list by using the Python reverse list method. For example, we have the following list:<\/p>\n

lst_reverse = [‘Banana’, ‘Mango’, ‘Strawberry’, ‘Peech’]<\/div>\n

This is how you may use the reverse method:<\/p>\n

lst_reverse.reverse()<\/div>\n

If you print this list, after using the reverse method, the output will be:<\/p>\n

[‘Peech’, ‘Strawberry’, ‘Mango’, ‘Banana’]<\/div>\n

The example code and output:<\/strong><\/p>\n

#A Demo reversing list items\r\n\r\nlst_reverse = ['Banana', 'Mango', 'Straberry', 'Peech']\r\n\r\nprint (\"The list before reverse method:\",lst_reverse)\r\n\r\nlst_reverse.reverse()\r\n\r\nprint (\"List after reverse method:\",lst_reverse)<\/pre>\n
The output:<\/strong><\/p>\n
The list before reverse method: [‘Banana’, ‘Mango’, ‘Strawberry’, ‘Peech’]
\nList after reverse method: [‘Peech’, ‘Strawberry’, ‘Mango’, ‘Banana’]<\/div>\n
Second way of reversing the list items – Slice<\/strong><\/h3>\n
The second way is a trick that applies to other iterables in Python. This way is extended slice; see an example below.<\/p>\n
In this example, a list of four fruit names is created. After that, the extended slice trick is used where default values for start and stop<\/em> (None) are given while -1 for the step<\/em> is used. See this working:<\/p>\n
#A Demo reversing list items\r\n\r\nlst_reverse = ['Banana', 'Mango', 'Strawberry', 'Peech']\r\n\r\nprint (\"The list before slice:\",lst_reverse)\r\n\r\nprint (\"List after slice:\",lst_reverse[::-1])<\/pre>\n
Output:<\/strong><\/p>\n
The list before slice: [‘Banana’, ‘Mango’, ‘Strawberry’, ‘Peech’]
\nList after slice: [‘Peech’, ‘Strawberry’, ‘Mango’, ‘Banana’]<\/div>\n
You may learn about the slice class here<\/a>.<\/p>\n
\n
The difference between the reverse method and slicing is that the list remains unchanged after reversing as using the second way.<\/p>\n
In the case of the Python list<\/a> reverse method, the list order is changed i.e. original list is reversed.\u00a0However, in the case of slicing, the original list remains the same.<\/p>\n<\/div>\n
See the following code and output below where I displayed the original list after using the slicing:<\/p>\n
#A Demo reversing list items\r\n\r\nlst_reverse =['Banana', 'Mango', 'Straberry', 'Peech']\r\n\r\nprint (\"The list before slice:\",lst_reverse)\r\n\r\nprint (\"List after slice:\",lst_reverse[::-1])\r\n\r\nprint (\"The original list after slice:\",lst_reverse)<\/pre>\n
Result:<\/strong><\/p>\n
The list before slice: [‘Banana’, ‘Mango’, ‘Strawberry’, ‘Peech’]
\nList after slice: [‘Peech’, ‘Strawberry’, ‘Mango’, ‘Banana’]
\nThe original list after slice: [‘Banana’, ‘Mango’, ‘Strawberry’, ‘Peech’]<\/div>\n
You can see, the list retains the same order as before slicing.<\/p>\n
Using slicing trick to reverse tuple\u00a0<\/strong><\/h3>\n
As mentioned earlier, the reverse method is specific to the list. What if you need to reverse a tuple? As such, a tuple is immutable i.e. once created it cannot be changed so this trick of using slice will work for tuple as well, as this does not change actual iterable.<\/p>\n
#A Demo reversing a tuple\r\n\r\ntuple_reverse = [5, 10, 15, 20, 25]\r\n\r\nprint (\"The tuple before slice:\",tuple_reverse)\r\n\r\nprint (\"Tuple after slice:\",tuple_reverse[::-1])<\/pre>\n
Output:<\/strong><\/p>\n
The tuple before slice: [5, 10, 15, 20, 25]
\nTuple after slice: [25, 20, 15, 10, 5]<\/div>\n
Here you go, it worked for Tuple as well.<\/p>\n","protected":false},"excerpt":{"rendered":"
The items in a list of Python can be reversed in different ways. Using the reverse method and slice trick. Read full tutorial for code and examples.<\/p>\n","protected":false},"author":1,"featured_media":11052,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[17],"tags":[],"yoast_head":"\n2 Ways\/Tricks to Reverse Python List with 4 Examples<\/title>\n<meta name=\"description\" content=\"The items in a list of Python can be reversed in different ways. 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