Python String casefold() Method

String capitalize() Method in Python

Last Updated : 05 Nov, 2024

The capitalize() method in Python is used to change the first letter of a string to uppercase and make all other letters lowercase. It is especially useful when we want to ensure that text follows title-like capitalization, where only the first letter is capitalized.

Let’s start with a simple example to understand the capitalize() functions:

Python

s = "hello WORLD"
res = s.capitalize()
print(res)

Output

Hello world

Explanation: In this example, capitalize() method converts the first character “h” to uppercase and change the rest of characters to lowercase.

Table of Content

Syntax of capitalize() Method
Example of capitalize() Method
What happens if the first character is a number?

Syntax of capitalize() Method

s.capitalize()

Parameters

The capitalize() method does not accept any parameters.

Return Value

The method returns a new string with the first character capitalized and all other characters in lowercase. The original string remains unchanged.

Example of capitalize() Method

The capitalize() method only affects the first letter of the string and doesn’t capitalize each word in multi-word strings.

Python

s = "multiple WORDS IN a String"
res = s.capitalize()
print(res)

Output

Multiple words in a string

Explanation: Even though there are multiple words, only the first character of the entire string is affected, while the remaining words are converted to lowercase.

What happens if the first character is a number?

When the first character of a string is a number, capitalize() method does not alter it because it only affects alphabetical characters. Instead, it will simply convert any following alphabetical characters to lowercase.

Python

s = "123hello WORLD"
res = s.capitalize()
print(res)

Output

123hello world

Explanation: Since capitalize() only targets alphabetical characters for capitalization, the initial number remains unchanged. While rest of the characters follow the capitalization rule which results in “123hello world“

Related Article:

Python String casefold() Method

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