New submission from Samwyse <samw...@gmail.com>:
Sometimes bad things happen when processing an in-place filter, leaving an
empty or incomplete input file and a backup file that needs to recovered. The
FileInput class has all the information needed to do this, but it is in private
instance variables. A .rollback() method could close the current file and
rename the backup file to its original name. For example:
for line in fileinput.input(inplace=True):
try:
...
except SomeError:
fileinput.rollback(close=False) # continue with next file
A simplistic implementation could be:
def rollback(self, close=True):
if self._backupfilename:
os.rename(self._backupfilename, self.filename)
self._backupfilename = None
if close:
self.close()
else:
self.nextfile()
----------
components: Library (Lib)
messages: 399361
nosy: samwyse
priority: normal
severity: normal
status: open
title: add .rollback() for in-place filters
type: enhancement
versions: Python 3.10, Python 3.11, Python 3.9
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue44882>
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