What is Python all() function
All Returns true if all of the items are True (or if the iterable is empty). All can be thought of as a sequence of AND operations on the provided iterables. It also short circuit the execution i.e. stop the execution as soon as the result is known.
Python all() Function Syntax
Syntax: all(list of iterables)
In the below example, we are showing the demonstration and working of the all() function with the help of code below.
Python3
# Here all the iterables are True so all# will return True and the same will be printedprint (all([True, True, True, True]))# Here the method will short-circuit at the # first item (False) and will return False.print (all([False, True, True, False]))# This statement will return False, as no# True is found in the iterablesprint (all([False, False, False])) |
Output
True False False
In this another example, we are seeing of all numbers in list1 are odd and by using all() function, if they are odd then we will return True otherwise False.
Python3
# Illustration of 'all' function in python 3# Take two lists list1=[]list2=[]# All numbers in list1 are in form: 4*i-3for i in range(1,21): list1.append(4*i-3)# list2 stores info of odd numbers in list1for i in range(0,20): list2.append(list1[i]%2==1)print('See whether all numbers in list1 are odd =>')print(all(list2)) |
Output
See whether all numbers in list1 are odd => True
Truth table
Any All in Python
Any and All are two built-in functions provided in Python used for successive And/Or. In this article, we will see about any and all in Python.