In Python, how can I open a file and read it on one line, and still be able to close the file afterwards?

Question

While working through this exercise I ran into a problem.

from sys import argv
from os.path import exists

script, from_file, to_file = argv
print \"Copying from         


        

Answer 1

The following Python code will accomplish your goal.

from contextlib import nested

with nested(open('input.txt', 'r'), open('output.txt', 'w')) as inp, out:
    indata = inp.read()
    ...
    out.write(out_data)