"""Compatibility helpers for the different Python versions."""

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import sys

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PY34 = sys.version_info >= (3, 4)

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PY35 = sys.version_info >= (3, 5)

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PY352 = sys.version_info >= (3, 5, 2)

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def flatten_list_bytes(list_of_data):

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"""Concatenate a sequence of bytes-like objects."""

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if not PY34:

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# On Python 3.3 and older, bytes.join() doesn't handle

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# memoryview.

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list_of_data = (

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bytes(data) if isinstance(data, memoryview) else data

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for data in list_of_data)

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return b''.join(list_of_data)

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