Python reversed() method is a builtin-method that returns an iterator that accesses the given sequence in the reverse order.
Syntax of Python reversed() function
Syntax: reversed(sequence)
Parameter :
- sequ : Sequence to be reversed.
Return : Returns an iterator that accesses the given sequence in the reverse order.
Example :
In the given example, we are reversing elements of the list with reversed() in Python.
Python3
my_list = ["apple", "banana", "cherry", "date"]reversed_list = list(reversed(my_list))print(reversed_list) |
Output :
['date', 'cherry', 'banana', 'apple']
Python reversed() Function Examples
Python reversed() with Built-In Sequence Objects
In the given example we have used reversed() with tuple and range. When using reversed with these objects we need to use the list() method to convert the output from reversed() to list.
Python3
# For tupleseqTuple = ('g', 'e', 'e', 'k', 's')print(list(reversed(seqTuple)))# For rangeseqRange = range(1, 5)print(list(reversed(seqRange))) |
Output :
['s', 'k', 'e', 'e', 'g'] [4, 3, 2, 1]
reversed() in Python with custom objects
In this example, we are creating a class gfg which includes a list of vowels we are using the reversed function to reverse the vowels.
Python3
class gfg: vowels = ['a', 'e', 'i', 'o', 'u'] # Function to reverse the list def __reversed__(self): return reversed(self.vowels)# Main Function if __name__ == '__main__': obj = gfg() print(list(reversed(obj))) |
Output :
['u', 'o', 'i', 'e', 'a']
Python reversed() with List
In this example, we are reversing a list of vowels with the reversed function in Python.
Python3
vowels = ['a', 'e', 'i', 'o', 'u']print(list(reversed(vowels))) |
Output:
['u', 'o', 'i', 'e', 'a']
Python reversed() with string
In this example, we are reversing a string with the reversed function in Python.
Python3
str = "GeeksforLazyroar"print(list(reversed(str))) |
Output :
['s', 'k', 'e', 'e', 'g', 'r', 'o', 'f', 's', 'k', 'e', 'e', 'G']
