Skip to content
Related Articles

Related Articles

Python | Test for False list
  • Last Updated : 04 Jan, 2019

Sometimes, we need to check if a list is completely True of False, 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 
# to check for False list 
# using naive method
  
# initializing list  
test_list = [False, False, False, False]
  
# printing original list
print ("The original list is : " + str(test_list))
  
flag = 0
  
# using naive method 
# to check for False list 
for i in test_list :
    if i == True :
        flag = 1
        break
  
# printing result
print ("Is List completely false ? : " +  str(bool(not flag)))
Output:
The original list is : [False, False, False, False]
Is List completely false ? : True

 
Method #2 : Using all()
This function tests each value to be False and if yes, returns boolean True, else returns false. The list iteration is done using list comprehension.




# Python3 code to demonstrate 
# to check for False list 
# using all()
  
# initializing list  
test_list = [False, False, False, False]
  
# printing original list
print ("The original list is : " + str(test_list))
  
flag = 0
  
# using all()
# to check for False list 
res = all(not i for i in test_list)
  
# printing result
print ("Is List completely false ? : " +  str(res))
Output:



The original list is : [False, False, False, False]
Is List completely false ? : True

 
Method #3 : Using any()
This function tests for any one of the True value, if found returns True, else returns False value. Negation of this function is used as the result.




# Python3 code to demonstrate 
# to check for False list 
# using any()
  
# initializing list  
test_list = [False, False, False, False]
  
# printing original list
print ("The original list is : " + str(test_list))
  
# using any()
# to check for False list 
res = not any(test_list)
  
# printing result
print ("Is List completely false ? : " +  str(res))
Output:
The original list is : [False, False, False, False]
Is List completely false ? : True

 Attention geek! Strengthen your foundations with the Python Programming Foundation Course and learn the basics.  

To begin with, your interview preparations Enhance your Data Structures concepts with the Python DS Course. And to begin with your Machine Learning Journey, join the Machine Learning – Basic Level Course

My Personal Notes arrow_drop_up
Recommended Articles
Page :