Question

I am learning python at the moment and I have a text file with lots of numbers separated by a newline (\n) like:

5
100
7
83

What’s the easiest way to read/write into a new text file putting the numbers into a comma delimited format like:

5, 100, 7, 83

Answer 1

For each line in the file, you want to split it apart on spaces and rejoin it with commas:

with open('infile.txt') as infile, open('outfile.txt', 'w') as outfile:
    outfile.write(', '.join(infile.read().split('\n')) + '\n')

You could also look at the csv module, if you want to do anything more complicated.