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"""Add things to old Pythons so I can pretend they are newer."""
# This file does lots of tricky stuff, so disable a bunch of lintisms.
# pylint: disable=redefined-builtin
# pylint: disable=unused-import
# pylint: disable=no-name-in-module
import os, re, sys
# Pythons 2 and 3 differ on where to get StringIO.
try:
from cStringIO import StringIO
BytesIO = StringIO
except ImportError:
from io import StringIO, BytesIO
# What's a string called?
try:
string_class = basestring
except NameError:
string_class = str
# Where do pickles come from?
try:
import cPickle as pickle
except ImportError:
import pickle
# range or xrange?
try:
range = xrange
except NameError:
range = range
# A function to iterate listlessly over a dict's items.
try:
{}.iteritems
except AttributeError:
def iitems(d):
"""Produce the items from dict `d`."""
return d.items()
else:
def iitems(d):
"""Produce the items from dict `d`."""
return d.iteritems()
# Reading Python source and interpreting the coding comment is a big deal.
if sys.version_info >= (3, 0):
# Python 3.2 provides `tokenize.open`, the best way to open source files.
import tokenize
open_python_source = tokenize.open
else:
def open_python_source(fname):
"""Open a source file the best way."""
return open(fname, "rU")
# Python 3.x is picky about bytes and strings, so provide methods to
# get them right, and make them no-ops in 2.x
if sys.version_info >= (3, 0):
def to_bytes(s):
"""Convert string `s` to bytes."""
return s.encode('utf8')
def to_string(b):
"""Convert bytes `b` to a string."""
return b.decode('utf8')
def binary_bytes(byte_values):
"""Produce a byte string with the ints from `byte_values`."""
return bytes(byte_values)
def byte_to_int(byte_value):
"""Turn an element of a bytes object into an int."""
return byte_value
def bytes_to_ints(bytes_value):
"""Turn a bytes object into a sequence of ints."""
# In Py3, iterating bytes gives ints.
return bytes_value
else:
def to_bytes(s):
"""Convert string `s` to bytes (no-op in 2.x)."""
return s
def to_string(b):
"""Convert bytes `b` to a string (no-op in 2.x)."""
return b
def binary_bytes(byte_values):
"""Produce a byte string with the ints from `byte_values`."""
return "".join(chr(b) for b in byte_values)
def byte_to_int(byte_value):
"""Turn an element of a bytes object into an int."""
return ord(byte_value)
def bytes_to_ints(bytes_value):
"""Turn a bytes object into a sequence of ints."""
for byte in bytes_value:
yield ord(byte)
try:
# In Py 2.x, the builtins were in __builtin__
BUILTINS = sys.modules['__builtin__']
except KeyError:
# In Py 3.x, they're in builtins
BUILTINS = sys.modules['builtins']
# imp was deprecated in Python 3.3
try:
import importlib, importlib.util
imp = None
except ImportError:
importlib = None
# we only want to use importlib if it has everything we need.
try:
importlib_util_find_spec = importlib.util.find_spec
except Exception:
import imp
importlib_util_find_spec = None
try:
PYC_MAGIC_NUMBER = importlib.util.MAGIC_NUMBER
except AttributeError:
PYC_MAGIC_NUMBER = imp.get_magic()
def import_local_file(modname):
"""Import a local file as a module.
Opens a file in the current directory named `modname`.py, imports it
as `modname`, and returns the module object.
"""
try:
from importlib.machinery import SourceFileLoader
except ImportError:
SourceFileLoader = None
modfile = modname + '.py'
if SourceFileLoader:
mod = SourceFileLoader(modname, modfile).load_module()
else:
for suff in imp.get_suffixes(): # pragma: part covered
if suff[0] == '.py':
break
with open(modfile, 'r') as f:
# pylint: disable=W0631
# (Using possibly undefined loop variable 'suff')
mod = imp.load_module(modname, f, modfile, suff)
return mod
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