The all() built-in function of Python

Function signature:

all(iterable)

Parameters:

iterable - A Python iterable. The containers list, tuple, set, dictionary and any object that support the iterable protocol of Python are collectively called iterables.

Return value:

Returns a Boolean value.

True when each of the elements in the iterable evaluates True or when len(iterable) is zero. Returns False otherwise.

Overview:

The all() function checks whether a Python iterable object has all of its elements evaluate to True. For example, a Python list object with some of its elements as None makes the all() method return False.
If the iterable object is empty, the all() function returns True.
This behaviour is the opposite of any() function where any() will return True if any of the elements of an iterable evaluate to True.

Example:

# Example Python program that checks few iterables - a list
# with numbers and None, an empty list and a tuple - whether
# all of their elements evaluate to True using the Python built-in
# function all().

# List with numbers and None
mixedList = [5, 7, 3, None, 15, 12, 11, None]
result = all(mixedList)
print(result)