None — Advanced Playground

Represents the absence of a value; Python's null equivalent

Python Playground

# None is a singleton
a = None
b = None
print(f"a is b: {a is b}")
print(f"id(a) == id(b): {id(a) == id(b)}")

# NoneType can't be instantiated
print(f"type(None): {type(None)}")

# None in containers
values = [1, None, "hello", None, 3]
non_none = [v for v in values if v is not None]
print(f"Filtered: {non_none}")

# None is falsy but not equal to other falsy values
print(f"None == False: {None == False}")
print(f"None == 0: {None == 0}")
print(f"None == '': {None == ''}")

Output

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None is a singleton — there is only ever one None object in memory. It is falsy but not equal to other falsy values like 0, False, or ''.

Challenge

Try modifying the code above to explore different behaviors. Can you extend the example to handle a new use case?

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