Swap the Case of a Python String with the swapcase() method

In this tutorial, we will look at how to swap the case of a Python string with the help of some examples.

What does it mean to swap the case of a string?

Swapping the case in a string refers to changing lowercase letters in the string to uppercase and uppercase letters in the string to lowercase. For example, if we swap the case for the string “Peter Parker”, we’ll get the string “pETER pARKER”.

How to swap the case of a String in Python?

You can use the built-in Python string function, swapcase() to reverse the case of the letters in a string. It changes the case of uppercase letters to lowercase and of the lowercase letters to uppercase. The following is the syntax –

# swap the case of string s
s.swapcase()

It returns a new string with the case of the letters reversed from the original string.

Examples

Let’s now look at some examples.

# create a string
s = "Peter Parker"
# swap the case
print(s.swapcase())

Output:

pETER pARKER

We get the resulting string in the swapped case.

Let’s look at another example.

# create a string
s = "dOnT tYpE lIKe tHIs"
# swap the case
print(s.swapcase())

Output:

DoNt TyPe LikE ThiS

You can see that the case of the characters in the resulting string is reversed.

Note that if you want to change the case of the entire string to uppercase, lowercase, or titlecase, use their respective built-in functions.

# create a string
s = "maTT murdock"
# uppercase
print(s.upper())
# lowercase
print(s.lower())
# titlecase
print(s.title())

Output:

MATT MURDOCK
matt murdock
Matt Murdock

Here, we used the string built-in functions, upper() to convert the string to uppercase, lower() to convert the string to lowercase, and title() to convert the string to titlecase.

FAQs

You might also be interested in –

• Swap Adjacent Characters in a Python String with this Method
• Easily Swap Keys and Values in a Python Dictionary with this method
• Swap Two Words in a String with these Methods in Python