This article aims to find words with a certain number of characters. In the code mentioned below, a Python program is given to find the words containing three characters in the text file.
Example
Input: Hello, how are you ? , n=3 Output: how are you Explanation: Output contains every character of the of length 3 from the input file.
Input File: File1.txt
File1.txt
Python Program to Find ‘n’ Character Words in a Text File
Below are the methods that we will cover in this article:
- Using Split and List Comprehension
- Using Regular Expressions
- Using Generator Function
Finding a Given Word in Text File using Split and List Comprehension
You can read the file, split its content into words, and then filter out words with ‘n’ characters using list comprehension.
PYTHON
def find_words_with_three_chars(file_path): with open(file_path, 'r') as file: content = file.read() words = content.split() words_with_three_chars = [word for word in words if len(word) == 3] return words_with_three_charsfile_name = "File1.txt"result = find_words_with_three_chars(file_name)print("Words containing three characters:")print(result) |
Output:
Words containing three characters: ['sit', 'sed', 'sit', 'ac.', 'dui', 'sit']
Time Complexity: O(N), where N is the total number of characters in the file.
Space Complexity: O(N + M), where M is the number of words with ‘n’ characters in the file.
Search a given word in a Text File using Regular Expressions
In Python, we have re module which provides regular expression functionality. The Regular expressions can be used to match patterns in the text which allows you to find words with ‘n’ characters.
Python3
import redef find_n_character_words(file_path, n): with open(file_path, 'r') as file: content = file.read() # Use regular expression to find words with 'n' characters pattern = r'\b\w{' + str(n) + r'}\b' words_with_n_chars = re.findall(pattern, content) return words_with_n_charsfile_name = "File1.txt"n = 3result = find_n_character_words(file_name, n)print(f"Words containing {n} characters:")print(result) |
Output:
Words containing 3 characters:
['sit', 'sed', 'sit', 'dui', 'sit']
Time Complexity: O(N), where N is the total number of characters in the file.
Space Complexity: O(N)
Get Words Containing three Characters in the File using Generator Function
Here you can use a generator function to yield words with ‘n’ characters one by one. This can be useful for large files.
Python3
def generate_n_character_words(file_path, n): with open(file_path, 'r') as file: for line in file: for word in line.split(): if len(word) == n: yield wordfile_name = "File1.txt"n = 3result_generator = generate_n_character_words(file_name, n)print(f"Words containing {n} characters:")for word in result_generator: print(word) |
Output:
Words containing 3 characters:
sit
sed
sit
dui
sit
Time Complexity: O(N), where N is the total number of characters in the file.
Space Complexity: O(M), where M is the number of words with ‘n’ characters in the file.
