Find Missing Numbers, Duplicates, and Ranges in Python

def find_missing_duplicates_ranges(numbers):
    """Find missing numbers, duplicates, and ranges in a list."""
    from collections import Counter
    
    if not numbers:
        return {"missing": [], "duplicates": [], "ranges": []}
    
    full_range = set(range(min(numbers), max(numbers) + 1))
    present = set(numbers)
    
    missing = sorted(full_range - present)
    duplicates = sorted([num for num, count in Counter(numbers).items() if count > 1])
    
    ranges = []
    if numbers:
        sorted_nums = sorted(numbers)
        start = prev = sorted_nums[0]
        
        for num in sorted_nums[1:]:
            if num == prev + 1:
                prev = num
            else:
                ranges.append((start, prev) if start != prev else (start,))
                start = prev = num
        ranges.append((start, prev) if start != prev else (start,))
    
    return {"missing": missing, "duplicates": duplicates, "ranges": ranges}


if __name__ == "__main__":
    example = [1, 1, 2, 4, 5, 5, 6, 9, 9]
    result = find_missing_duplicates_ranges(example)
    
    print(f"Input: {example}")
    print(f"Missing numbers: {result['missing']}")
    print(f"Duplicates: {result['duplicates']}")
    print(f"Ranges: {result['ranges']}")