Sometimes, we need to check if a list is completely True, these occurrences come more often in testing purposes after the development phase. Hence, having a knowledge of all this is necessary and useful. Lets discuss certain ways in which this can be performed.
Method #1 : Naive Method
In the naive method, we just run a loop from beg to end of list and check manually for each value. This is the most basic way to perform this particular task.
# Python3 code to demonstrate # Pure List Test# using naive method # initializing list test_list = [True, True, True, True] # printing original listprint ("The original list is : " + str(test_list)) flag = 0 # using naive method # Pure List Testfor i in test_list : if not i : flag = 1 break # printing resultprint ("Is List completely True ? : " + str(bool(not flag))) |
The original list is : [True, True, True, True] Is List completely True ? : True
Method #2 : Using all()
This function tests each value to be True and if yes, returns boolean True, else returns false. The list iteration is done using list comprehension.
# Python3 code to demonstrate # Pure List Test# using all() # initializing list test_list = [True, True, True, True] # printing original listprint ("The original list is : " + str(test_list)) flag = 0 # using all()# Pure List Test res = all(i for i in test_list) # printing resultprint ("Is List completely True ? : " + str(res)) |
The original list is : [True, True, True, True] Is List completely True ? : True
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