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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)
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