Arkadiusz Bulski wrote: > What would be the most performance efficient way of checking if a bytes is > all zeros? Currently its `key == b'\x00' * len(key)` however, because its > Python 2/3 compatible: > > sum(key) == 0 is invalid > key == bytes(len(key)) is invalid > > I already considered precomputing the rhs value. > Length of key is unknown, could be few bytes, could be megabytes.
Things you might try: data = ... bytes ... (1) not data.strip(b"\x00") Worst case: creates another len(data)-1 byte string (2) # preparation search = re.compile(b"[^\0x00]").search # actual check search(data) is not None -- https://mail.python.org/mailman/listinfo/python-list
