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import os
import sys
try:
import urllib2 as parse # noqa
except ImportError:
# Python 3
from urllib import parse # noqa
PY_VERSION = sys.version_info[:2] # (2, 7)
PY_VERSION_MAJOR = PY_VERSION[0]
PY2 = PY_VERSION_MAJOR == 2
PY3 = PY_VERSION_MAJOR >= 3
PY26_PLUS = PY2 and sys.version_info[1] >= 6
WIN32 = sys.platform in {'win32', 'cygwin'}
ENCODING = 'utf-8'
if PY3:
def bstr(value, encoding=ENCODING):
return bytes(value, encoding=encoding)
elif PY26_PLUS:
bstr = bytes
else:
# Python <= 2.5
bstr = str
if PY3:
def bchr(i):
return bytes([i])
int_types = (int,)
maxsize = sys.maxsize
ustr = str
else:
bchr = chr
maxsize = 2**31
ustr = unicode # noqa
int_types = (int, long) # noqa
# The max 32-bit signed integer range for Qt is (-2147483648 to 2147483647)
maxint = (2**31) - 1
def setenv(key, value):
"""Compatibility wrapper for setting environment variables
Windows requires putenv(). Unix only requires os.environ.
"""
if not PY3 and isinstance(value, ustr):
value = value.encode(ENCODING, 'replace')
os.environ[key] = value
os.putenv(key, value)
def unsetenv(key):
"""Compatibility wrapper for clearing environment variables"""
os.environ.pop(key, None)
if hasattr(os, 'unsetenv'):
os.unsetenv(key)
def no_op(value):
"""Return the value as-is"""
return value
def byte_offset_to_int_converter():
"""Return a function to convert byte string offsets into integers
Indexing into python3 bytes returns integers. Python2 returns str.
Thus, on Python2 we need to use `ord()` to convert the byte into
an integer. It's already an int on Python3, so we use no_op there.
"""
if PY2:
result = ord
else:
result = no_op
return result
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