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If I have some file-like object and do the following:
F = open('abc', 'r')
...
loc = F.tell()
F.seek(loc-10)
What does seek do? Does is start at the beginning of the file and read loc-10 bytes? Or is it smart enough just to back up 10 bytes?
It is OS- and libc-specific. the
file.seek()operation is delegated to thefseek(3)C call for actual OS-level files.