Eryk Sun <[email protected]> added the comment:
Every time open(r"test.txt", "w") is called, the existing "test.txt" file gets
overwritten in the filesystem as an empty file. For each iteration,
setdefault() returns a reference to the first file object, which advances its
file pointer with each fh.write("\nHello\n") call. For the last write, the file
pointer is at offset 693 (i.e. 7 * 99), and the OS first writes null bytes up
to the file pointer. This is normal behavior, not a bug.
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nosy: +eryksun
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<https://bugs.python.org/issue46193>
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