Python String istitle() Method

The istitle() method in Python checks whether each word in a string starts with an uppercase letter followed by lowercase letters. It returns True if the string is in title case.

Syntax

string.istitle()

Returns:

• True – if all words are title-cased
• False – otherwise

Example 1: Valid Title Case

text = "Hello World"
print(text.istitle())

True

Example 2: Not a Title Case

text = "hello world"
print(text.istitle())

False

Example 3: Mixed Case

text = "Hello world"
print(text.istitle())

False

Use Cases

• Validating titles or headers in a document
• Checking formatting before applying transformations
• Filtering data for properly capitalized phrases

Important Notes

• Only alphabetic characters are considered. Numbers or symbols don't affect the result.
• Empty strings return False.

Common Mistake

Words like "The USA" are not in title case (because "USA" is in all caps), so istitle() will return False.

Practice Problem

Write a program that reads a line of text from the user and checks if it's in title case:

text = input("Enter a sentence: ")
if text.istitle():
    print("The text is in title case.")
else:
    print("The text is NOT in title case.")

Summary

• string.istitle() checks if each word starts with a capital letter.
• Returns True for title case, False otherwise.
• Commonly used for validation in formatting.