How can I get rid of double spaces? (Python)

Question

I have a data file (.txt) containing some lines, each line as following:

0 45 1 31 2 54 3 54 4 64

With a white space before zero, two spaces between each two integers and a white space at the end. What I want is to have it like following:

0 45 1 31 2 54 3 54 4 64

I am trying everything (using Python) but I am not successful!

Of course at the end I want to reform it to:

45 31 54 54 64

That is eliminating the numbers 0 to 4 as well. But this last step is maybe easier to do if I reach the first one.

For example I have tried this:

with open('myfile', rt') as openfile, open('myfile_2, 'a') as csvfile:
    for line in openfile:
            A = str(line).replace('  ', ' ')
            Writer = csv.writer(csvfile, delimiter=' ', quotechar=' ')
            Writer.writerow([A])

But yet in the `myfile_2' the string is not corrected.

Answer 1

Made Changes Accordingly:

with open('newtes.txt', 'w') as outfile, open('tes.txt', 'r') as infile:
    for line in infile:
        outfile.write(line.replace('  ',' ').strip())

edit 1 : strip() added as suggested in the comment
edit 2 : Made Changes.