Python3 - Loop through CSV and add row to variable for next loop?

[OptionsOptionsOptions]

Python 3.8.2

• Loop through CSV file and add row to variable for next loop?

with open('final-output.csv') as csvfile:
    readCSV = csv.reader(csvfile, delimiter=',')
    for row in readCSV:

        result = round(float(row[0]),1)

How do I pass result to a variable for the next loop? It would then be over written for the following loop.

Example:
5
10
15
10
2
4


5+10
10+15
15+10
10+2
2+4

Thanks

 

[gaussian]

You can use a variable outside the loop that you maintain.

You can also use `with csv.reader(csvfile, delimiter=',') as readCSV` to do automatic resource clean up.

If you are simply summing numbers there are easier ways such as `sum(numArray)` but this requires you to read all the numbers into an array beforehand.

 

[2rosy]

you can shift and add. pandas, numpy, ... are the libraries you want. A for loop is what you don't want

import numpy as np
a=[5,10,15,10,2,4]
np.array(a[:-1]) + np.array(a[1:])