Chunk.__len__ should return length of data

[bessman]

import bincopy
hexdata = bincopy("myfile.hex")
print(len(next(hexdata.segments.chunks(size=32))))

2

I find this surprising. Anyone doing len(chunk) probably wants the length of its data member, not the fact that it's a two-tuple. I propose implementing Chunk like so:

class Chunk(namedtuple("Chunk", ["address", "data"])):  # Or _Chunk, depending on outcome of #35
    def __len___(self):
        return len(self.data)

While this would technically change the API, I argue that it is extremely unlikely to break anything; anyone doing len(chunk) almost certainly means len(chunk.data).

[eerimoq]

Good suggestion. Part of version 18.0.0.