Serhiy Storchaka added the comment:
Instead of the loop you can use writelines():
f.writelines([b'\0' * bs] * (size // bs))
It would be nice to add a comment that estimate why os.ftruncate() or
seek+write can't be used here. At least a link to this issue with short
estimation.
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nosy: +serhiy.storchaka
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<http://bugs.python.org/issue21116>
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