Here is a code fragment, where I am trying to copy a file, avoiding
overwrites and race conditions. The filename gets a '02','03','04' etc
appended to the end if a file with that name already exists.
I know the writing of the single space is overkill, but I am surprised
I cannot find an example of this floating around the web and newsgroups
my understanding of 'os.open' and 'os.fdopen' is minimal
## start fragment
i = 0
while True:
if i >= 100: raise RanOutFileNamesError(fullpath)
i += 1
if i > 1:
name0 = '%s_%02i%s' % (suggested_name, i, file_extension)
else:
assert i == 1
name0 = '%s%s' % (suggested_name, file_extension)
fullpath = os.path.join(path0, name0)
# create dummy file, force overwrite
try:
fd = os.open(
fullpath,
os.O_CREAT | os.O_EXCL | os.O_WRONLY)
except OSError:
continue
# is this really necessary?
file = os.fdopen(fd, "w")
file.write(' ')
file.close()
shutil.copyfile(original_filepath, fullpath)
return fullpath
## end fragment
--
http://mail.python.org/mailman/listinfo/python-list
