On 2018-04-01 18:55, 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.
Have you tried:
not key.lstrip(b'\x00')
? (Although the result of the lstrip could be as long as the original.)
Or:
set(key) == set(b'\x00')
? (The set will never have more than 256 members.)
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