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Python – Test if List contains elements in Range

  • Last Updated : 01 Mar, 2020

A lot of times, while working with data, we have a problem in which we need to make sure that a container or a list is having elements in just one range. This has application in Data Domains. Let’s discuss certain ways in which this task can be performed.

Method #1 : Using loop
This is brute force method in which this task can be performed. In this, we just check using if condition if element falls in range, and break if we find even one occurrence out of range.

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# Python3 code to demonstrate 
# Test if List contains elements in Range
# using loop
  
# Initializing loop 
test_list = [4, 5, 6, 7, 3, 9]
  
# printing original list 
print("The original list is : " + str(test_list))
  
# Initialization of range 
i, j = 3, 10
  
# Test if List contains elements in Range
# using loop
res = True
for ele in test_list:
    if ele < i or ele >= j :
        res = False 
        break
  
# printing result 
print ("Does list contain all elements in range : " + str(res))
Output :



The original list is : [4, 5, 6, 7, 3, 9]
Does list contain all elements in range : True

 

Method #2 : Using all()
This is alternative and shorter way to perform this task. In this we use check operation as a parameter to all() and returns True when all elements in range.




# Python3 code to demonstrate 
# Test if List contains elements in Range
# using all()
  
# Initializing loop 
test_list = [4, 5, 6, 7, 3, 9]
  
# printing original list 
print("The original list is : " + str(test_list))
  
# Initialization of range 
i, j = 3, 10
  
# Test if List contains elements in Range
# using all()
res = all(ele >= i and ele < j for ele in test_list) 
  
# printing result 
print ("Does list contain all elements in range : " + str(res))
Output :
The original list is : [4, 5, 6, 7, 3, 9]
Does list contain all elements in range : True



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