Strings &amp; text

text = "  Hello, Python Learners!  "

print(f"Original: '{text}'")
print(f"Lowercase: '{text.lower()}'")
print(f"Uppercase: '{text.upper()}'")
print(f"Title case: '{text.title()}'")
print(f"Stripped: '{text.strip()}'")
print(f"Length: {len(text)}")
print(f"Replace: '{text.replace('Python', 'Programming')}'")
print(f"S…

15 0 Open

How to Detect if a String Contains Only ASCII in Python

This code defines a function that checks whether every character in a given string is an ASCII character (Unicode code point < 128) and demonstrates it with multiple test cases.

ascii string validation

def is_ascii_only(text: str) -> bool:
    """Return True if all characters in text are ASCII, False otherwise."""
    return all(ord(char) < 128 for char in text)


if __name__ == "__main__":
    # Test cases
    samples = [
        "Hello, world!",
        "Café au lait",
        "日本語テキスト",
        "ASCII only 123",
…

17 0 Open

How to Encode and Decode UTF-8 in Python

Convert a Python string to UTF-8 bytes with .encode() and back to text with .decode(), with a simple demo function.

utf-8 encode decode

def encode_decode_demo(text: str):
    encoded = text.encode("utf-8")
    decoded = encoded.decode("utf-8")
    print(f"Original string: {text}")
    print(f"Encoded bytes: {encoded}")
    print(f"Decoded string: {decoded}")
    print(f"Match: {text == decoded}")

if __name__ == "__main__":
    encode_decode_demo("Hel…

14 0 Open

How to Escape HTML in Python

This code demonstrates how to use Python's `html.escape` function to safely encode user input for display in HTML, preventing XSS attacks.

html escaping security

import html

def escape_user_input(user_input: str) -> str:
    """Escape HTML-sensitive characters for safe display."""
    return html.escape(user_input)

if __name__ == "__main__":
    sample_user_input = '<script>alert("XSS")</script> & \'quotes\''
    safe_output = escape_user_input(sample_user_input)
    print("…

string-manipulation text-formatting beginner

How to Format Text in Python (Beginner's Guide)

This beginner-friendly Python script demonstrates text formatting basics: stripping whitespace, converting to title case, replacing substrings, splitting into words, and generating a snippet.

text = "  hello world, welcome to python skillset!  "
cleaned = text.strip()
title_cased = cleaned.title()
replaced = title_cased.replace("Python", "PYTHON")
words = replaced.split()
word_count = len(words)
first_three = " ".join(words[:3])
snippet = first_three + "..."
print("Original:", repr(text))
print("Stripped:"…

string whitespace text-cleaning

How to Strip Whitespace in Python

This code demonstrates how to remove leading and trailing whitespace from a string using the built-in strip() method.

def strip_whitespace(text: str) -> str:
    return text.strip()

if __name__ == "__main__":
    sample = "   Hello, world!   "
    result = strip_whitespace(sample)
    print(f"Original: '{sample}'")
    print(f"Stripped: '{result}'")

14 0 Open

string isalpha validation

Python String isalpha() Method: Check if String is Alphabetic

This code defines a function that uses Python's str.isalpha() method to determine if a string contains only alphabetic characters, with a demonstration on several test strings.

def is_alphabetic(s):
    return s.isalpha()

if __name__ == "__main__":
    test_strings = ["Hello", "Hello123", "World!", "Python", ""]
    for s in test_strings:
        print(f"{s!r}: {is_alphabetic(s)}")

text-processing string-methods word-count

Text Processor Functions for Beginners in Python

Demonstrates simple text-processing utilities: word counting, word reversal, whitespace normalization, and lowercase conversion using basic string methods.

def count_words(text):
    """Return the number of words in a string."""
    return len(text.split())

def reverse_words(text):
    """Return the text with words in reverse order."""
    return ' '.join(text.split()[::-1])

def remove_extra_spaces(text):
    """Return text with extra whitespace collapsed to a single s…