On 2025-08-28 03:08, Grant Edwards via Python-list wrote:
On 2025-08-27, Chris Angelico via Python-list <[email protected]> wrote:
On Thu, 28 Aug 2025 at 01:28, Ethan Carter <[email protected]> wrote:
def copy(s, d):
"""Copies text file named S to text file named D."""
with open(s) as src:
with open(d, "w") as dst:
try:
dst.write(src.read())
except Exception:
os.remove(d)
raise
In the event of an exception, you attempt to remove the destination
file BEFORE exiting the `with` statement. While that might succeed on
some platforms, it will potentially fail on others.
Specifically, it should work on Unix/Linux OSes. I _think_ it will
fail on (most) Windows OSes, but making definitive statements about
how things work on "Windows" is beyond my ken.
Windows won't let you delete an open file.
If an OS did let you delete an open file, how would you expect it to
behave? Would you still be able to use the file? Would the file be
marked for deletion and be deleted when it was finally closed?
The Zen of Python says:
In the face of ambiguity, refuse the temptation to guess.
So, close it before attempting to delete it.
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