Reference library

Dictionaries & sets

Key–value maps, uniqueness, counting, grouping, and fast lookups.

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Dictionaries & sets easy

How to Check Data Type and Inspect Dictionaries and Sets in Python

Inspect dictionaries and sets by printing their contents, types, and sizes using a small helper function.

dictionaries sets isinstance
Python 
def check_data(data):
    """Helper to inspect dictionaries and sets."""
    if isinstance(data, dict):
        print(f"Dictionary with {len(data)} keys")
        for key, value in data.items():
            print(f"  {key}: {value} ({type(value).__name__})")
    elif isinstance(data, set):
        print(f"Set with {le…
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