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Python FTW: Under the Hood

All-true-ation

Understand how the all function in Python evaluates empty and nested containers. Learn why an empty iterable returns True, while nested empty lists can change the result, helping you avoid common pitfalls with this built-in function.

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Let’s explore the all() function with empty containers.

Python 3.5
print(all([True, True, True]))
print(all([True, True, False]))
print("--------")
print(all([]))
print(all([[]]))
print(all([[[]]]))

Why’s this a True-False alteration?

Explanation

  • The
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