Hello everybody, During this tutorial we’ll see alternative ways to reverse a string in Python.
As we know, we are able to reverse an inventory victimisation reverse() technique however Python doesn’t have the reverse() method for the string.
Here are some alternate and simple ways to reverse a string.
Ways to Reverse String in Python
string1 = "comman man" string2 = "" i = len(string1)-1 while(i>=0): string2 = string2 + string1[i] i = i-1 print "original = " + string1 print "reverse = " + string2
original = common man
reverse = remmargorp yzarc eht
In on top of program, we’ve started a loop from the last index (length-1) to initial index (0) of string1. In every step of loop, it’ll decide the character from right-side in string1 and concatenate with string2.
2. Using Recursion
def reverse_it(string): if len(string)==0: return string else: return reverse_it(string[1:]) + string print "added " + string string1 = "comman man" string2 = reverse_it(string1) print "original = " + string1 print "reversed = " + string2
In on top of the program, there’s a reverse_it() technique that accepts a string then it’ll check if the string is empty or not, if empty then it’ll come back the string otherwise it will decide itself by passing string from its second character to last character.
String = “hello”
After job reverse_it() technique once more and again there’ll be a degree once the string is going to be empty then the condition
if len(string) == 0:
will be true, it’ll come back the string. come back statement can throw the execution, wherever it came from.
Return reverse_it(string[1:]) + string
the “+ string “is going to be dead next, which is able to add the primary letter ultimately.
def create_stack(): #it will create a List named as stack and return it stack =  return stack def push(stack,element): #it will add a new element to List stack.append(element) def pop(stack): #it will delete the last element from List if len(stack) == 0: return return stack.pop() def reverse(string): #method to reverse the string using stack's functions n = len(string) #to create a empty list (stack) stack = create_stack() #inserting character of string into List for i in range(0,n): push(stack,string[i]) #making string empty string = "" #getting last element of the List (stack) and storing it into string for i in range(0,n): string = string + pop(stack) return string string1 = "comman man" string2 = reverse(string1) print "original = " + string1 print "reversed = " + string2
In on top of the program, we’re victimisation construct of the stack having push and pop functions.
To implement stack construct we’re victimisation list.
When we decision reverse() technique, it’ll produce an inventory named as ‘stack’ and insert all the characters of string into list victimisation push() technique.
ultimately it’ll fetch all the weather within the list from last to initial one by one and store them into the string.
4.Using Extended Slice
string = "comman man" print "original = " + string string = string[::-1] print "reversed = " + string
Mostly extended slice is employed for skipping the steps however if we have a tendency to place -1 in third ‘step’ or ‘stride’ argument then we are able to get the reverse of a string, list and tupple.
string = "comman man" print "original = " + string #convrting string into list list1 = list(string) #applying reverse method of list list1.reverse() #converting list into string string = ''.join(list1) print "reversed = " + string
The string doesn’t have reverse() technique however lists have. therefore we have a tendency to are changing a string into a list, performing arts reverse() operation and once more changing it back to string victimisation ‘ ’.join() technique.
Comment below if you’ve got queries or apprehend the other to reverse a string in python.