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# -*- coding: utf-8 -*-
#
# Copyright 2011 Sybren A. Stüvel <sybren@stuvel.eu>
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
'''Python compatibility wrappers.'''
from __future__ import absolute_import
from struct import pack
try:
# < Python3
unicode_type = unicode
have_python3 = False
except NameError:
# Python3.
unicode_type = str
have_python3 = True
# Fake byte literals.
if str is unicode_type:
def byte_literal(s):
return s.encode('latin1')
else:
def byte_literal(s):
return s
# ``long`` is no more. Do type detection using this instead.
try:
integer_types = (int, long)
except NameError:
integer_types = (int,)
b = byte_literal
try:
# Python 2.6 or higher.
bytes_type = bytes
except NameError:
# Python 2.5
bytes_type = str
def is_bytes(obj):
"""
Determines whether the given value is a byte string.
:param obj:
The value to test.
:returns:
``True`` if ``value`` is a byte string; ``False`` otherwise.
"""
return isinstance(obj, bytes_type)
def is_integer(obj):
"""
Determines whether the given value is an integer.
:param obj:
The value to test.
:returns:
``True`` if ``value`` is an integer; ``False`` otherwise.
"""
return isinstance(obj, integer_types)
def byte(num):
"""
Converts a number between 0 and 255 (both inclusive) to a base-256 (byte)
representation.
Use it as a replacement for ``chr`` where you are expecting a byte
because this will work on all current versions of Python::
>>> byte(0)
'\x00'
>>> byte(255)
'\xff'
:param num:
An unsigned integer between 0 and 255 (both inclusive).
:returns:
A single byte.
"""
return pack("B", num)
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