How does the all() method work in Python and in what cases is it used?

The all() method in Python takes an iterable object and returns True if all elements of this object are true (or if the object is empty), otherwise — False.

Example of usage:

numbers = [1, 2, 3, 4]
print(all(num > 0 for num in numbers))  # True, all numbers are greater than 0

flags = [True, True, False]
print(all(flags))  # False, there is at least one False

all() is often used to check that all conditions or elements satisfy a certain criterion, for example, data validation or checking the state of multiple flags.