Python Type Hints & Typing Module Examples

A learning repository for Python type hints and the typing module.
This repo contains examples and explanations of common Python typing features like List, Tuple, Set, Dict, Union, Optional, Any, Callable, and more.

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🔹 Features

• Basic Python type hints (int, str, float, etc.)
• Typing module examples:
  • List, Tuple, Set, Dict
  • Union, Optional, Any, Callable
• Real-world examples:
  • Counting letters in a string
  • Using Callable for function parameters
  • Combining Union, Optional, and Any
• Safe dictionary access using .get(), .keys(), .values(), .items()
• List comprehensions and filtering examples
• Step-by-step explanations for beginners

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🔹 Example

from typing import List, Dict

def count_letters(word: str) -> Dict[str, int]:
    counts: Dict[str, int] = {}
    for letter in word:
        counts[letter] = counts.get(letter, 0) + 1
    return counts

print(count_letters("banana"))
# Output: {'b': 1, 'a': 3, 'n': 2}