Python Built-in Function reversed:

The reversed() is an inbuilt function in Python that returns a new sequence object with the elements in reverse order. However, the original sequence will not be updated.


The signature for the reversed() function is as shown below. Here, l stores an object that the function returns.


Parameters and return type

  • This method takes one parameter sequence. This sequence can be a list, tuple, dictionary or, a string.
  • However, it returns a reversed object of sequence.

Python Built-in Function reversed Examples:

Example 1: For example, let us initialize a list, and a tuple object with some numbers. Thereafter, we will use the reversed function to reverse the elements. So, it returns the sequence object that has the elements in the reverse order of original sequence. In order to print the values, we have to typecast this to a list or tuple.

l = [159, 254, 11, 8, 4559, 32]
#Using reversed and printing
print("reversed list - ",list(reversed(l)))
print("reversed tuple - ",tuple(reversed(t)))


reversed list -  [32, 4559, 8, 11, 254, 159]
reversed tuple -  (55, 331, 4, 22)

Example 2: In this example, we will take a string and a dictionary. We will reverse this sequence and print it as a list. As we can see, it takes string as a list of characters and dictionary as a list of keys.

s = "python"
#Using reversed and printing
print("reversed string - ",list(reversed(s)))
print("reversed dictionary - ",list(reversed(d)))


reversed string -  ['n', 'o', 'h', 't', 'y', 'p']
reversed dictionary -  [3, 2, 1]

Example 3: In this case, let us take a set containing string. It will raise a TypeError exception because set objects cannot be reversed.

city={"chennai", "delhi","mumbai", "hyderabad"}
#Using reversed and printing


Traceback (most recent call last):
  File "", line 3, in 
TypeError: 'set' object is not reversible


The reversed() function returns a new sequence object with elements in reverse order.


Happy Learning 🙂

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