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"""
Compatibility constants and functions for the different Python versions.
"""
import sys
# Python 2.6 or older?
PY26 = (sys.version_info < (2, 7))
# Python 3.0 or newer?
PY3 = (sys.version_info >= (3,))
# Python 3.3 or newer?
PY33 = (sys.version_info >= (3, 3))
# Python 3.4 or newer?
PY34 = sys.version_info >= (3, 4)
if PY3:
integer_types = (int,)
bytes_type = bytes
text_type = str
string_types = (bytes, str)
BYTES_TYPES = (bytes, bytearray, memoryview)
else:
integer_types = (int, long,)
bytes_type = str
text_type = unicode
string_types = basestring
if PY26:
BYTES_TYPES = (str, bytearray, buffer)
else: # Python 2.7
BYTES_TYPES = (str, bytearray, memoryview, buffer)
def flatten_bytes(data):
"""
Convert bytes-like objects (bytes, bytearray, memoryview, buffer) to
a bytes string.
"""
if not isinstance(data, BYTES_TYPES):
raise TypeError('data argument must be byte-ish (%r)',
type(data))
if PY34:
# In Python 3.4, socket.send() and bytes.join() accept memoryview
# and bytearray
return data
if not data:
return b''
if not PY3 and isinstance(data, (buffer, bytearray)):
return str(data)
elif not PY26 and isinstance(data, memoryview):
return data.tobytes()
else:
return data
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