Serhiy Storchaka added the comment:
Following example copies the entire buffer object while copying only smart part
is needed:
m = memoryview(b'x'*10**6)
b'%.100b' % m
I don't know whether this is important use case that is worth an optimization.
The workaround is using slicing rather than truncating in format:
b'%b' % m[:100]
Or in the case of general buffer object:
b'%b' % memoryview(m).cast('B')[:100]
But in that case it is not hard to add an explicit conversion to bytes.
b'%b' % bytes(memoryview(m).cast('B')[:100])
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<http://bugs.python.org/issue28856>
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