Python - all() - Check truthiness of all elements in an iterable

Overview of the Python all() function. Check if all objects in iterable are truthy.

all(iterable) returns True if all objects in provided iterable are "truthy".

If every item evaluates to True, all() returns True. If even one item is "falsy" (evaluating to False), all() returns False.

Important - If the iterable is empty, all() returns True by default!

In Python, values like 0, None, [], {}, "", and () are "falsy" and evaluate to False. Any non-zero numbers, non-empty containers, and most other objects are considered "truthy." A truthy objects returns True after calling bool(object).

my_list = [5, 1, "devcuriosity", True]

result = all(my_list)

print(result)  # True

Output:

True

my_list = [5, 1, "devcuriosity", False]

result = all(my_list)

print(result)  # False

Output:

False

Using all() with an empty iterable

my_tuple = []

result = all(my_tuple)

print(result)  # True

Output:

True

It's important to remember about this feature of all() because it might be a bit counterintuitive.

Key Points to remember about all()

• Evaluates Truthiness: all() checks if all elements in an iterable are truthy.

• Default for Empty Iterables: When the iterable is empty, all() returns True by default.

• Common Use Cases: all() is commonly used to verify that all items are truthy.

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