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

import sys

PY34 = sys.version_info >= (3, 4)
PY35 = sys.version_info >= (3, 5)


def flatten_list_bytes(list_of_data):
    """Concatenate a sequence of bytes-like objects."""
    if not PY34:
        # On Python 3.3 and older, bytes.join() doesn't handle
        # memoryview.
        list_of_data = (
            bytes(data) if isinstance(data, memoryview) else data
            for data in list_of_data)
    return b''.join(list_of_data)