Python list | reverse() - GeeksforGeeks

reverse() is an inbuilt method in Python programming language that reverses objects of list in place.

Syntax:

list_name.reverse()

Parameters:

There are no parameters

Returns:

The reverse() method does not return any value but 
reverse the given object from the list.

Code#1:

# Python3 program to demonstrate the  
# use of reverse method  
   
# a list of numbers 
list1 = [1, 2, 3, 4, 1, 2, 6]  
list1.reverse()  
print(list1)  
  
# a list of characters 
list2 = ['a', 'b', 'c', 'd', 'a', 'a']  
list2.reverse()  
print(list2)  

Output:

[6, 2, 1, 4, 3, 2, 1]
['a', 'a', 'd', 'c', 'b', 'a']

Error:

When anything other than list is used in place of list, 
then it returns an AttributeError

Code#2:

# Python3 program to demonstrate the  
# error in reverse() method 
   
# error when string is used in place of list 
string = "abgedge" 
string.reverse()  
print(string) 

Output:

Traceback (most recent call last):
  File "/home/b3cf360e62d8812babb5549c3a4d3d30.py", line 5, in 
    string.reverse() 
AttributeError: 'str' object has no attribute 'reverse'

Practical Application:
Given a list of numbers, check if the list is palindrome.
Note: palindrome-sequence that reads the same backwards as forwards

Code#3:

# Python3 program for the  
# practical application of reverse()  
  
list1 = [1, 2, 3, 2, 1] 
  
# store a copy of list 
list2 = list1.copy()   
  
# reverse the list 
list2.reverse()  
  
# compare reversed and original list  
if list1 == list2: 
    print("Palindrome")  
else: 
    print("Not Palindrome")  

Output:

Palindrome

My Personal Notes

Recommended Posts:

Striver

Striver(underscore)79 at Codechef and codeforces D

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