[issue30700] fileinput inplace clobbers file without leaving backup on decode errors

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[issue30700] fileinput inplace clobbers file without leaving backup on decode errors

New submission from switchnode: Consider the script: $ cat nop.py #!/usr/bin/env python import fileinput srt = fileinput.input(inplace=True) print(srt.readline(), end='') for line in srt: print(line, end='') Called on text files, it will do nothing. $ ls -alh test.* -rw-r--r-- 1 501 ut