Python program for finding sum of products of all sub arrays (in sequence)

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import math
for _ in range (int(input())):
     n = int(input())
     A = list(map(int, input().split()))
     final=[]
     for  i in range(len(A)):
         if i==len(A)-1:
             final=final.append(A)
         else:
             for p in range (i+1,len(A)+1):
                final.append(math.prod(A[i : p]))
     print(sum(final))

What I have tried:

Traceback (most recent call last):
File "C:\Users\user\OneDrive\Desktop\New folder\test.py", line 12, in <module>
print(sum(final))
TypeError: 'NoneType' object is not iterable

i don't why it is showing like this

Posted 23-Jul-22 20:12pm

nikhilsharma0708

Updated 23-Jul-22 21:16pm

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OriginalGriff · Answer 1 · 2022-07-23T20:21:00

If you don't understand an error message, google it: TypeError: 'NoneType' object is not iterable - Google Search[^]
Any of those links explains why you get it - now all you have to do is look at what you entered as data and then use the debugger to find out what exactly is going on.

Since we don't have any idea what you typed, we can't do any of that for you!

Richard MacCutchan · Answer 2 · 2022-07-23T21:16:00

The following line may well cause problems:

Python

final=final.append(A)

Remove the "final=" thus:

Python

final.append(A)

Also you should add some print statements after each final.append statement, to see what the results are:

Python

print(F"{final=}")

That will give you some nice debug output.

Python program for finding sum of products of all sub arrays (in sequence)

2 solutions

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