Python String istitle() Method

The istitle() method in Python is used to check whether a string follows the title case formatting. In a title-cased string, the first letter of each word is capitalized, and all other letters in the word are in lowercase. This method is especially useful when working with formatted text such as titles, headlines, or document headers.

Let's understand with the help of an example:

s = "Python is Fun"
# Checking if the string is in title case
res = s.istitle()
print(res) 

False

Explanation

• The string 's' is in title case because the first letter of each word is uppercase, and the rest of the letters are lowercase.
• The method returns True, confirming that the string adheres to the title case format.

Syntax of istitle() Method

string.istitle()

Parameters

• The istitle() method does not take any parameters.

Return Type

• Returns True if the string is in title case.
• Returns False otherwise.

Examples of istitle() method

1. Checking a proper title-case string

Here, we test the istitle() method with a correctly formatted title-case string to verify its behavior.

s = "Python Programming"
# Verifying if the string is in title case
result = s.istitle()
print(result)  

True

Explanation

• The method evaluates the string 's' and confirms it follows title case.
• Both words start with uppercase letters followed by lowercase letters resulting in True.

2. String with improper casing

In this example, we analyze a string that does not conform to title case rules. This helps illustrate how istitle() handles such cases.

s = "python Programming"
# Verifying if the string is in title case
res = s.istitle()
print(res) 

False

Explanation

• The string 's' does not adhere to title case because the first word, "python," starts with a lowercase letter.
• As a result, the method returns False.

3. Strings with special characters and numbers

This example demonstrates how istitle() behaves when the string contains special characters or numbers. These elements do not affect the title case evaluation.

s = "Python 3.9 Is Awesome"
# Checking title case for a string with numbers and special characters
result = s.istitle()
print(result) 

True

Explanation

• The words "Python," "Is," and "Awesome" are in title case.
• Numbers and special characters do not affect the result, so the method returns True.

4. Empty string

Let's what happens if we pass an empty string to istitle().

s = ""
# Checking an empty string
res = s.istitle()
print(res)  

False

Explanation

• An empty string does not have any words to evaluate, so the method returns False.

5. Mixed cases with acronyms

Here, we examine a string containing an acronym to understand how istitle() processes such cases.

s = "NASA Is Amazing"
# Verifying a string with an acronym
res = s.istitle()
print(res)  

False

Explanation

• The acronym "NASA" is all uppercase, but the other words adhere to title case.
• This is considered valid, so the method returns True.