How TO Reverse a String in Python
Learn how to reverse a String in Python.
There is no built-in function to reverse a String in Python.
The fastest (and easiest?) way is to use a slice that steps backwards, -1.
Example Explained
We have a string, "Hello World", which we want to reverse:
The String to Reverse
txt = "Hello World"[::-1]
print(txt)
Create a slice that starts at the end of the string, and moves backwards.
The slice statement [::-1] is the same as
[11:0:-1] which means start at position 11
(because "Hello "World" has 11 characters), end at position 0, move with the
step -1, negative one, which means one step backwards.
Slice the String
txt = "Hello World"[::-1]
print(txt)
Now we have a string txt that reads "Hello
World" backwards.
Print the String to demonstrate the result
Print the List
txt = "Hello World"[::-1]
print(txt)
Create a Function
If you like to have a function where you can send your strings, and return them backwards, you can create a function and insert the code from the example above.
Example
def my_function(x):
return x[::-1]
mytxt =
my_function("I wonder how this text looks like backwards")
print(mytxt)
Run example »
Example Explained
Create a function that takes a String as an argument.
Create a Function
def my_function(x):
return x[::-1]
mytxt =
my_function("I wonder how this text looks like backwards")
print(mytxt)
Slice the string starting at the end of the string and move backwards.
Slice the String
def my_function(x):
return x[::-1]
mytxt =
my_function("I wonder how this text looks like backwards")
print(mytxt)
Return the backward String
Return the String
def my_function(x):
return
x[::-1]
mytxt =
my_function("I wonder how this text looks like backwards")
print(mytxt )
Call the function, with a string as a parameter:
Call the Function
def my_function(x):
return
x[:-1]
mytxt = my_function("I
wonder how this text looks like backwards")
print(mytxt)
Print the result:
Print the Result
def my_function(x):
return
x[::-1]
mytxt = my_function("I wonder how this text looks like backwards")
print(mytxt)
