How to incrementally assign variable names using numbers inside a for loop in python?

Question

I have a simple code where I want to update the variable names as follows:

n = 5

for i in range(0, n):
    train_fold_[i], val_fold_[i] = result[i][0],result[i][1]

I want the above code to generate a total of 10 variables with names train_fold_0, val_fold_0, train_fold_1, val_fold_1,......, train_fold_4, val_fold_4.

However, when I run this code, it is only generating 2 variables as follows: train_fold_i, val_fold_i.

I know this is extremely simple, but can someone please help me out with this as I'm relatively new to python.

Usually you would use a data structure in this case (probably a list). Why do you want to have 10 different variables? — Jack Taylor
– Jack Taylor, Commented Mar 14, 2021 at 1:05
Do train_fold, val_fold = zip(*[result[i] for i in range(n)]). You can now access your ten values as train_fold[0], val_fold[0], train_fold[1], etc. — Samwise
– Samwise, Commented Mar 14, 2021 at 1:11
If n == len(result) you can do it more simply: train_fold, val_fold = zip(*result) — Samwise
– Samwise, Commented Mar 14, 2021 at 1:13

Miguel Trejo · Accepted Answer · 2021-03-14 00:56:48Z

1

You could use exec

n = 5

for i in range(0, n):
    value1, value2 = i, i+1
    exec(f'train_fold_{i}, val_fold_{i} = {value1}, {value2}')

then

print(train_fold_3, val_fold_3)
>>> 3 4

answered Mar 14, 2021 at 0:56

Miguel Trejo

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