writing to file

[snippsat]

Use code tag @jenost.
Here one way.

with open('regina.txt') as f,open('regina_id.txt', 'w') as f_out:
    l = [i.strip() for i in f]
    lst = zip(l[::2], l[1::2])
    for numb in lst:
        f_out.write(f'{numb[0]} == {numb[1]}\n')