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
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txt = "Hello World" [::-1]print(txt)
Create a slice that starts at the end of the string, and moves backwards.
In this particular example, the slice statement [::-1] means start at the end of the string and end at position 0, move with the step -1, negative one, which means one step backwards.
Slice the String
12
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
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txt = "Hello World"[::-1]print(txt)
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
123456
def my_function(x): return x[::-1] mytxt = my_function("I wonder how this text looks like backwards") print(mytxt)
Example Explained
Create a function that takes a String as an argument.
Create a Function
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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
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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
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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
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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
123456
def my_function(x): return x[::-1] mytxt = my_function("I wonder how this text looks like backwards") print(mytxt)
