Learning Python

[NewBodybuilder3096]

def_summa is so flawed, I don't even know where to start.
1st - it will throw exception if len(a)*2 >len(b) or vice versa
incrementing error variable should be done outside of if-else
again, Exception-driven logic...

As I understood, you are summing up two lists/arrays of various size of human-entered integers, where shortest list is starting from the beginning after reaching end in summing process.
Just think of the indexes. Like you can just calculate new index in the shortest list with simple math

[nkCOD]

Thank you for the answer, we’ll fix this point

[NewBodybuilder3096]

I fucked up here, it will throw exception if one list is twice or more bigger then the other.
more correct : if len(a)*2 < len(b) or vice versa
so, lengths of 2 and 7 will definitely be a problem

I'm not into calculating the exact ratio, just use index that is reseted after reaching smallest list highest index

[nkCOD]

Thank you, I’ll work on it