Python - write txt file with a list

Question

I have a test.txt that contains:

-
anything1
go
-
anything2
go

And i wanna replace the '-' with my list and some query. Here is my code:

x = ['1', '2']
i=0
with open("test.txt", "r") as fin:
    with open("result.txt", "w") as fout:
        for line in fin:
            fout.write(line.replace('-','\nuse '+(str(x[i]))+'\ngo\n'))
            i+=i

But my result is:

use 1
go
anything1 
go

use 1
go
anything2 
go

I need that the second 'use' be 'use 2' and not 'use 1'.

How I can fix this?

Thanks

Answer 1

Try this instead:

i = (x for x in ['1', '2'])

with open("test.txt") as fin, open("result.txt", "w") as fout:
    for line in fin:
        if line.startswith('-'):
            fout.write(line.replace('-', '\nuse {}\ngo\n'.format(next(i))))
        else:
            fout.write(line)