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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-msg=F0401,W0611,W0622
# F0401: Unable to import blah
# W0611: Unused import blah
# W0622: Redefining built-in blah
import os, sys
# Python 2.3 doesn't have `set`
try:
set = set # new in 2.4
except NameError:
from sets import Set as set
# Python 2.3 doesn't have `sorted`.
try:
sorted = sorted
except NameError:
def sorted(iterable):
"""A 2.3-compatible implementation of `sorted`."""
lst = list(iterable)
lst.sort()
return lst
# 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
# Exec is a statement in Py2, a function in Py3
if sys.hexversion > 0x03000000:
def exec_function(source, filename, global_map):
"""A wrapper around exec()."""
exec(compile(source, filename, "exec"), global_map)
else:
# OK, this is pretty gross. In Py2, exec was a statement, but that will
# be a syntax error if we try to put it in a Py3 file, even if it is never
# executed. So hide it inside an evaluated string literal instead.
eval(compile("""\
def exec_function(source, filename, global_map):
exec compile(source, filename, "exec") in global_map
""",
"<exec_function>", "exec"
))
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