Reference library

Python Code Samples

Copy-ready Python snippets by topic and difficulty — short, focused, and runnable in the browser editor.

3 matches
Strings & text easy

How to Parse and Clean Text in Python

This code defines three helper functions to parse text into lowercase words, count unique word frequencies, and clean text by removing punctuation and extra whitespace.

text parsing string cleaning word frequency
Python 
def extract_words(text: str) -> list[str]:
    """Return a list of lowercase words from the given text."""
    return [word.lower() for word in text.split() if word.isalpha()]


def count_unique_words(text: str) -> dict[str, int]:
    """Return a dictionary with unique words and their frequencies."""
    words = extra…
12 0 Open
Dictionaries & sets easy

Count Word Frequency in Python with dict

Count how often each word appears in a text using Python's collections.Counter and regular expressions.

dictionary counter frequency
Python 
from collections import Counter
import re

def count_word_frequency(text):
    """Count frequency of each word in text (case-insensitive)."""
    words = re.findall(r"\b\w+\b", text.lower())
    return dict(Counter(words))

if __name__ == "__main__":
    sample_text = "The quick brown fox jumps over the lazy dog. The …
13 0 Open
Dictionaries & sets easy

Count word frequency in Python with dict and Counter

Count how often each word appears in a string using Counter, converted to a plain dict, and print results alphabetically.

counter dictionary word-frequency
Python 
from collections import Counter
import re

def count_word_frequency(text):
    words = re.findall(r'\b\w+\b', text.lower())
    return dict(Counter(words))

if __name__ == "__main__":
    sample_text = "The quick brown fox jumps over the lazy dog. The dog barks, and the fox runs."
    frequency = count_word_frequency(…
12 0 Open

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Guide: free Python code samples library

Copy-ready Python snippets for learners and developers

PythonSkillset code samples are short, focused examples organised by topic and difficulty. Every snippet is server-rendered HTML — readable by search engines and easy to copy. Open any sample, read the notes, copy the code, then press Try in editor to run it in the browser with Pyodide.

How to use this library

  1. Pick a topic section — strings, lists, files, functions, and more
  2. Open a sample, read How it works, and copy the code block
  3. Run it in the IDE, tweak values, then take a related quiz or tutorial lesson

Samples vs tutorials and challenges

Samples are quick reference — one concept per page. For step-by-step teaching, use our Python tutorials. To test yourself, try quizzes or coding challenges. Clean up style with the Python formatter.

Related coding tools

Free online Python IDE Write and run Python in your browser — no install. Free Python code formatter Format with autopep8 — side-by-side PEP 8 cleanup.