Python Library Functions in Action

This code block contains examples of using various built-in Python library functions, including generating random strings, finding files, counting occurrences of substrings, reading and writing files, removing duplicates from a list, sorting a list by length, reversing a string, and getting a random element from a list.

Technology Stack : os, re, json, random, string

Code Type : Code block

Code Difficulty : Intermediate

                
                    
import os
import re
import json
import random
import string

def generate_random_string(length=10):
    return ''.join(random.choices(string.ascii_letters + string.digits, k=length))

def find_files(directory, extension):
    return [os.path.join(dp, f) for dp, dn, filenames in os.walk(directory) for f in filenames if f.endswith(extension)]

def count_occurrences(text, substring):
    return len(re.findall(re.escape(substring), text))

def read_file(file_path):
    with open(file_path, 'r') as file:
        return file.read()

def write_file(file_path, content):
    with open(file_path, 'w') as file:
        file.write(content)

def remove_duplicates_from_list(input_list):
    return list(set(input_list))

def sort_list_by_length(input_list):
    return sorted(input_list, key=len)

def reverse_string(input_string):
    return input_string[::-1]

def get_random_element_from_list(input_list):
    return random.choice(input_list)

def main():
    # Generate a random string
    random_str = generate_random_string(15)
    
    # Find all .txt files in the current directory
    txt_files = find_files('.', '.txt')
    
    # Count occurrences of "hello" in a sample text
    sample_text = "hello world, hello again!"
    count_hello = count_occurrences(sample_text, "hello")
    
    # Read content from a file
    file_content = read_file('sample.txt')
    
    # Write content to a file
    write_file('output.txt', 'This is a test file.')
    
    # Remove duplicates from a list
    duplicate_list = [1, 2, 2, 3, 4, 4, 5]
    unique_list = remove_duplicates_from_list(duplicate_list)
    
    # Sort a list by length
    string_list = ["apple", "banana", "cherry", "date"]
    sorted_list = sort_list_by_length(string_list)
    
    # Reverse a string
    reversed_str = reverse_string("hello")
    
    # Get a random element from a list
    random_element = get_random_element_from_list(["apple", "banana", "cherry", "date"])
    
    # Create a JSON object with the results
    results = {
        "random_str": random_str,
        "txt_files": txt_files,
        "count_hello": count_hello,
        "file_content": file_content,
        "unique_list": unique_list,
        "sorted_list": sorted_list,
        "reversed_str": reversed_str,
        "random_element": random_element
    }
    
    # Write the JSON object to a file
    write_file('results.json', json.dumps(results, indent=4))

if __name__ == "__main__":
    main()