Python list | reverse()

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


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