Save to a file, but avoid overwriting an existing file

[Ben Finney]

Cameron Simpson <cs at zip.com.au> writes:

> Therefore you need to continue _only_ if you get EEXIST. Otherwise
> abort.

If you target Python 3.3 or later, you can catch “FileExistsError”
<URL:http://docs.python.org/3/library/exceptions.html#FileExistsError>
which is far simpler than messing around with ‘errno’ values.

-- 
 \     “I know you believe you understood what you think I said, but I |
  `\         am not sure you realize that what you heard is not what I |
_o__)                                     meant.” —Robert J. McCloskey |
Ben Finney