Adam Funk writes: > On 2016-04-26, Random832 wrote: > >> On Tue, Apr 26, 2016, at 09:30, Adam Funk wrote: >>> I recently discovered pathlib in the Python 3 standard library, & find >>> it very useful, but I'm a bit surprised that it doesn't offer things >>> like is_readable() and is_writable. Is there a good reason for that? >> >> Well, one reason would be EAFP. Just try to open the file and see if it >> gives you a PermissionError. > > I understand that in general, but the tool I'm working on here takes a > command-line option to specify an output directory, & I'd rather not > start processing the data (which involves GETting from a REST service, > processing, and PUTting back modifications to the data) only to crash > after the first batch because of a user error.
Open an output file first. Crash before reading the first batch. -- https://mail.python.org/mailman/listinfo/python-list