Python program to capitalize each word\'s first letter

Let's understand the problem statement: we need to convert a given string to a title case, which involves capitalizing the first letter of each word while converting the remaining letters to lowercase. The following are the various ways to capitalize each word's first letter in a string ?

• Using title() method
• Using capitalize() method
• Using upper() method
• Importing string module
• Importing regex module
• Capitalizing a String in a File

Using the title() Method

The title() method in Python strings is used to capitalize the first letter of each word in a string while converting the remaining letters to lowercase. It ensures that every word starts with an uppercase letter.

Syntax

string.title()

Example

In the following example, we have used the title() method to capitalize each word's first letter ?

my_string = "welcome to tutorialspoint"
print("Original String:", my_string)
new_str = my_string.title()
print("Capitalized String:", new_str)

Original String: welcome to tutorialspoint
Capitalized String: Welcome To Tutorialspoint

Using capitalize() Method

The capitalize() method in Python is used to convert the first character of a string to uppercase while ensuring that all other characters in the string are converted to lowercase. This method is useful for standardizing text where only the first letter of the entire string needs to be capitalized.

Syntax

string.capitalize()

Example

Here, we iterate through a string using a for loop to capitalize each word using the capitalize() method. First, we convert the string into a list using the split() method. After capitalizing each word, we use the join() method to convert the list back into a string ?

string_1 = "welcome to tutorialspoint"
print("Original String:", string_1)

words = string_1.split()
capitalized_words = []

for word in words:
    capitalized_words.append(word.capitalize())

result = " ".join(capitalized_words)    
print("Capitalized String:", result)

Original String: welcome to tutorialspoint
Capitalized String: Welcome To Tutorialspoint

Using upper() Method

The upper() method is used to convert all characters in a string to uppercase. This method ensures that every letter in the string is transformed to its uppercase form, leaving non-alphabetic characters unchanged.

Syntax

string.upper()

Example

We can convert the first letter of each word to uppercase using the upper() method. First, we convert the string to a list using the split() method. Then, we capitalize the character at index 0 of each word and append the remaining characters to a new list. Finally, we join the list back into a string using the join() method ?

string_1 = "welcome to python tutorials"
print("Original String:", string_1)

words = string_1.split()
capitalized_words = []

for word in words:
    capitalized_words.append(word[0].upper() + word[1:])
    
result = " ".join(capitalized_words)
print("Capitalized String:", result)

Original String: welcome to python tutorials
Capitalized String: Welcome To Python Tutorials

Using the string Module

The string module contains a capwords() method, which capitalizes each word's first character. For this method, we need to import the string module using the import keyword.

Example

In the following example, we have capitalized the first character of each word in a string using the string module ?

import string 

my_string = "hello world"
print("Original String:", my_string)
capitalized_string = string.capwords(my_string)
print("Capitalized String:", capitalized_string)

Original String: hello world
Capitalized String: Hello World

Using Regular Expressions

In Python, regex (regular expressions) is a special sequence of characters that helps match or find other strings. Using regex, we can search for the starting character of each word and capitalize it.

To use this method, we need to import the re library. This method only capitalizes the first character of each word in a string and does not modify the whitespaces between the words.

Example

In the following example, we have capitalized each word's first character in a string using the re module ?

import re

def convert_to_uppercase(match):
    return match.group(1) + match.group(2).upper()

string = "python is an object oriented programming language"
result = re.sub("(^|\s)(\S)", convert_to_uppercase, string)
print("Original String:", string)
print("Capitalized String:", result)

Original String: python is an object oriented programming language
Capitalized String: Python Is An Object Oriented Programming Language

Capitalizing a String in a File

We can also capitalize each word in a file. For this, we first create a file using the open() method in 'w' write mode. We then use the open() method to open the file in reading mode and iterate through every line using a for loop.

We can capitalize the first letter of every word using the title() method.

Example

The following is an example of capitalizing a string in a file ?

# Writing to file
with open('capitalize.txt', 'w') as f:
    f.write("welcome to tutorialspoint")

# Reading and capitalizing
with open('capitalize.txt', 'r') as f:
    for line in f:
        output = line.title()
        print("Original:", line.strip())
        print("Capitalized:", output.strip())

Original: welcome to tutorialspoint
Capitalized: Welcome To Tutorialspoint

Comparison

Conclusion

The title() method is the simplest approach for capitalizing each word's first letter in Python. For more control over whitespace handling, use string.capwords(). Regular expressions provide the most flexibility for complex capitalization patterns.