I did some work today on a project to verify a backup copy
of a large directory with subdirectories.

To give some context: the calls "iterdir" and "exists" below
belong to "pathlib.Path" objects, in the first case to a directory.

At first, one part in my code looked like this:

for entry in source.iterdir():
if not entry.exists():
print( "Can't happen." )

. Soon, "Can't happen." appeared on my screen (and there was nothing
deleted from the directory between the "iterdir" and the "exists")!

Now I edited it thus:

for entry in source.iterdir():
if not entry.exists():
print( "\007\nSomething's is wrong with this path. "+
"It's probably too long. I can't use it this way.\n" +
"In this case, it might help to shorten it manually "+
"in source and target and restart!\n" + str( entry ))

.

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