Python Function All

Python all(iterable)

all() is a built-in function in Python 3, to check if all items of an iterable is True. It takes one argument, iterable.

Argument

iterable

The iterable argument is the collection whose all entries are to be checked. It can typically be a list, str, dict, tuple etc.

Return Value

The return value would be a boolean. If and only if all entries of iterable are True, it returns True. This function essentially performs a Boolean AND operation over all elements.

If even one of them is not True, it would return False.

The all() operation is equivalent to (not internally implemented exactly like this)

def all(iterable):
    for element in iterable:
        if not element:
            return False
    return True

Code Sample

print(all([6, 7])) #=> True
print(all([6, 7, None])) #=> False  Because this has None
print(all([0, 6, 7])) #=> False Because this has zero
print(all([9, 8, [1, 2]])) #=> True
print(all([9, 8, []])) #=> False Because it has []
print(all([9, 8, [1, 2, []]])) #=> True
print(all([9, 8, {}])) #=> False Because it has {}
print(all([9, 8, {'engine': 'Gcloud'}])) #=> True

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