String inversa en Python (6 formas diferentes)

La biblioteca de strings de Python no es compatible con » reverse() » incorporado como lo hacen otros contenedores de Python como list, por lo tanto, conocer otros métodos para invertir strings puede resultar útil. Este artículo analiza varias formas de lograrlo en Python . 

Ejemplo:

def reverse(s):
    str = ""
    for i in s:
        str = i + str
    return str
 
s = "Geeksforgeeks"
 
print("The original string is : ", end="")
print(s)
 
print("The reversed string(using loops) is : ", end="")
print(reverse(s))

def reverse(s):
    if len(s) == 0:
        return s
    else:
        return reverse(s[1:]) + s[0]
 
 
s = "Geeksforgeeks"
 
print("The original string is : ", end="")
print(s)
 
print("The reversed string(using recursion) is : ", end="")
print(reverse(s))

# Function to create an empty stack. It
# initializes size of stack as 0
def createStack():
    stack = []
    return stack
 
# Function to determine the size of the stack
def size(stack):
    return len(stack)
 
# Stack is empty if the size is 0
def isEmpty(stack):
    if size(stack) == 0:
        return true
 
# Function to add an item to stack . It
# increases size by 1
def push(stack, item):
    stack.append(item)
 
# Function to remove an item from stack.
# It decreases size by 1
def pop(stack):
    if isEmpty(stack):
        return
    return stack.pop()
 
# A stack based function to reverse a string
def reverse(string):
    n = len(string)
 
    # Create a empty stack
    stack = createStack()
 
    # Push all characters of string to stack
    for i in range(0, n, 1):
        push(stack, string[i])
 
    # Making the string empty since all
    # characters are saved in stack
    string = ""
 
    # Pop all characters of string and put
    # them back to string
    for i in range(0, n, 1):
        string += pop(stack)
 
    return string
 
 
# Driver code
s = "Geeksforgeeks"
print("The original string is : ", end="")
print(s)
print("The reversed string(using stack) is : ", end="")
print(reverse(s))

# Function to reverse a string
def reverse(string):
    string = string[::-1]
    return string
 
s = "Geeksforgeeks"
 
print("The original string is : ", end="")
print(s)
 
print("The reversed string(using extended slice syntax) is : ", end="")
print(reverse(s))

# Python code to reverse a string
# using reversed()
 
# Function to reverse a string
def reverse(string):
    string = "".join(reversed(string))
    return string
 
s = "Geeksforgeeks"
 
print("The original string is : ", end="")
print(s)
 
print("The reversed string(using reversed) is : ", end="")
print(reverse(s))

# Function to reverse a string
def reverse(string):
    string = [string[i] for i in range(len(string)-1, -1, -1)]
    return "".join(string)
 
s = "Geeksforgeeks"
 
print("The original string  is : ", s)
 
print("The reversed string(using reversed) is : ", reverse(s))

# Function to reverse a string
# by converting string to list
# then reversed it and again convert it to string
def reverse(string):
    string = list(string)
    string.reverse()
    return "".join(string)
 
s = "Geeksforgeeks"
 
print("The original string  is : ", s)
 
print("The reversed string(using reversed) is : ", reverse(s))
 
# This code is contributed by Susobhan AKhuli