Christian Heimes <[email protected]> added the comment:
The high level and low level variants behave the same if you pass in the same
flags. You are using the append flag in "open()", but you don't pass the
os.O_APPEND flag to "os.open()".
>>> import os
>>> fd = os.open('log', os.O_WRONLY | os.O_APPEND | os.O_CREAT)
>>> os.lseek(fd, 1, os.SEEK_SET)
1
>>> os.write(fd, b'foo')
3
>>> os.close(fd)
>>> os.stat('log').st_size
3
>>> fd = os.open('log2', os.O_WRONLY | os.O_CREAT)
>>> os.lseek(fd, 1, os.SEEK_SET)
1
>>> os.write(fd, b'foo')
3
>>> os.close(fd)
>>> os.stat('log2').st_size
4
----------
nosy: +christian.heimes
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<https://bugs.python.org/issue43028>
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