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Python – Element Index in Range Tuples

  • Last Updated : 17 Jun, 2021

Sometimes, while working with Python data, we can have a problem in which we need to find the element position in continuous equi ranged tuples in list. This problem has applications in many domains including day-day programming and competitive programming. Let’s discuss certain ways in which this task can be performed.
 

Input
test_list = [(0, 10), (11, 20), (21, 30), (31, 40)] 
K = 37 
Output : 3
Input
test_list = [(0, 9), (10, 19), (20, 29), (30, 39)] 
K = 37 
Output : 3 
 

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Method #1 : Using loop 
This is brute force way in which this task can be performed. In this, we iterate for all the elements in the list and then using comparison operators, find the position of the desired element.
 



Python3




# Python3 code to demonstrate working of
# Element Index in Range Tuples
# Using loop
 
# initializing list
test_list = [(0, 10), (11, 20), (21, 30), (31, 40), (41, 50)]
 
# printing original list
print("The original list is : " + str(test_list))
 
# initializing Element
K = 37
 
# Element Index in Range Tuples
# Using loop
res = None
for idx, ele in enumerate(test_list):
    if K >= ele[0] and K <= ele[1]:
        res = idx
         
# printing result
print("The position of element : " + str(res))
Output : 
The original list is : [(0, 10), (11, 20), (21, 30), (31, 40), (41, 50)]
The position of element : 3

 

 
Method #2 : Using formula 
The element position can also be divised without using a loop, but to extract the same using division of element with the range size, being it consistent.
 

Python3




# Python3 code to demonstrate working of
# Element Index in Range Tuples
# Using formula
 
# initializing list
test_list = [(0, 10), (11, 20), (21, 30), (31, 40), (41, 50)]
 
# printing original list
print("The original list is : " + str(test_list))
 
# initializing Element
K = 37
 
# Element Index in Range Tuples
# Using formula
res = (K // (test_list[0][1] - test_list[0][0]))
         
# printing result
print("The position of element : " + str(res))
Output : 
The original list is : [(0, 10), (11, 20), (21, 30), (31, 40), (41, 50)]
The position of element : 3

 




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