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Python | Summation of integers in heterogenous list
  • Last Updated : 27 Aug, 2019

Sometimes, while working with Python, we can come across a problem in which we require to find the sum of list. This problem is easier to solve. But this can get complex in case we have mixture of data types to go along with it. Let’s discuss certain ways in which this task can be performed.

Method #1 : Using Type casting + Exception Handling
We can employ a brute force method to type caste each element and catch the exception if any occurs. This can ensure that only integers are added to sum and hence can solve the problem.




# Python3 code to demonstrate working of
# Summation of integers in heterogenous list
# using type caste and exception handling
  
# initializing list
test_list = [5, 6, "gfg", 8, (5, 7), 'is', 9]
  
# printing original list
print("The original list is : " + str(test_list))
  
# Summation of integers in heterogenous list
# using type caste and exception handling
res = 0
for ele in test_list:
    try:
        res += int(ele)
    except :
        pass
  
# printing result 
print("Summation of integers in list : " + str(res))
Output :
The original list is : [5, 6, 'gfg', 8, (5, 7), 'is', 9]
Summation of integers in list : 28

 

Method #2 : Using sum() + isinstance()
This problem can also be solved using the inbuilt function of sum() and it also supports the instance filter using isinstance() which can be feeded with integer and hence solve the problem.






# Python3 code to demonstrate working of
# Summation of integers in heterogenous list
# using sum() + isinstance()
  
# initializing list
test_list = [5, 6, "gfg", 8, (5, 7), 'is', 9]
  
# printing original list
print("The original list is : " + str(test_list))
  
# Summation of integers in heterogenous list
# using sum() + isinstance()
res = sum(filter(lambda i: isinstance(i, int), test_list))
  
# printing result 
print("Summation of integers in list : " + str(res))
Output :
The original list is : [5, 6, 'gfg', 8, (5, 7), 'is', 9]
Summation of integers in list : 28

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