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Python – Count elements in record tuple

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  • Last Updated : 22 Sep, 2022
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Sometimes, while working with data in form of records, we can have a problem in which we need to find the total element counts of all the records received. This is a very common application that can occur in Data Science domain. Let’s discuss certain ways in which this task can be performed.

Method #1: Using len() + generator expression 

This is the most basic method to achieve solution to this task. In this, we iterate over whole nested lists using generator expression and get the count of elements using len(). 

Python3




# Python3 code to demonstrate working of
# Record elements count
# using len() + generator expression
 
# initialize list
test_list = [(2, 4), (6, 7), (5, 1), (6, 10), (8, 7)]
 
# printing original list
print("The original list : " + str(test_list))
 
# Record elements count
# using len() + generator expression
res = len(list((int(j) for i in test_list for j in i)))
 
# printing result
print("The total count of list is : " + str(res))

Output : 

The original list : [(2, 4), (6, 7), (5, 1), (6, 10), (8, 7)]
The total count of list is : 10

Method #2 : Using len() + map() + chain.from_iterable() The combination of above methods can also be used to perform this task. In this, the extension of finding total count is done by the combination of map() and from_iterable(). 

Python3




# Python3 code to demonstrate working of
# Record elements count
# using len() + map() + chain.from_iterable()
from itertools import chain
 
# initialize list
test_list = [(2, 4), (6, 7), (5, 1), (6, 10), (8, 7)]
 
# printing original list
print("The original list : " + str(test_list))
 
# Record elements count
# using len() + map() + chain.from_iterable()
res = len(list((map(int, chain.from_iterable(test_list)))))
 
# printing result
print("The total count of list is : " + str(res))

Output : 

The original list : [(2, 4), (6, 7), (5, 1), (6, 10), (8, 7)]
The total count of list is : 10

Method #3 : Using extend(),list(),len() methods

Python3




# Python3 code to demonstrate working of
# Record elements count
 
# initialize list
test_list = [(2, 4), (6, 7), (5, 1), (6, 10), (8, 7)]
 
# printing original list
print("The original list : " + str(test_list))
 
res=[]
for i in test_list:
    res.extend(list(i))
# printing result
print("The total count of list is : " + str(len(res)))

Output

The original list : [(2, 4), (6, 7), (5, 1), (6, 10), (8, 7)]
The total count of list is : 10

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