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# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
"""Add things to old Pythons so I can pretend they are newer."""
import sys
# A function to iterate listlessly over a dict's items, and one to get the
# items as a list.
try:
{}.iteritems
except AttributeError:
# Python 3
def iitems(d):
"""Produce the items from dict `d`."""
return d.items()
def litems(d):
"""Return a list of items from dict `d`."""
return list(d.items())
else:
# Python 2
def iitems(d):
"""Produce the items from dict `d`."""
return d.iteritems()
def litems(d):
"""Return a list of items from dict `d`."""
return d.items()
# Getting the `next` function from an iterator is different in 2 and 3.
try:
iter([]).next
except AttributeError:
def iternext(seq):
"""Get the `next` function for iterating over `seq`."""
return iter(seq).__next__
else:
def iternext(seq):
"""Get the `next` function for iterating over `seq`."""
return iter(seq).next
# Python 3.x is picky about bytes and strings, so provide methods to
# get them right.
def to_bytes(s):
"""Convert string `s` to bytes."""
return s.encode('utf8')
def to_string(b):
"""Convert bytes `b` to 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):
"""Turn a byte indexed from a bytes object into an int."""
return byte
def bytes_to_ints(bytes_value):
"""Turn a bytes object into a sequence of ints."""
# In Python 3, iterating bytes gives ints.
return bytes_value
try:
# In Python 2.x, the builtins were in __builtin__
BUILTINS = sys.modules['__builtin__']
except KeyError:
# In Python 3.x, they're in builtins
BUILTINS = sys.modules['builtins']
# imp was deprecated in Python 3.3
try:
import importlib
import 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
# What is the .pyc magic number for this version of Python?
try:
PYC_MAGIC_NUMBER = importlib.util.MAGIC_NUMBER
except AttributeError:
PYC_MAGIC_NUMBER = imp.get_magic()
def code_object(fn):
"""Get the code object from a function."""
try:
return fn.func_code
except AttributeError:
return fn.__code__
try:
from types import SimpleNamespace
except ImportError:
# The code from https://docs.python.org/3/library/types.html#types.SimpleNamespace
class SimpleNamespace:
"""Python implementation of SimpleNamespace, for Python 2."""
def __init__(self, **kwargs):
self.__dict__.update(kwargs)
def __repr__(self):
keys = sorted(self.__dict__)
items = ("{}={!r}".format(k, self.__dict__[k]) for k in keys)
return "{}({})".format(type(self).__name__, ", ".join(items))
def format_local_datetime(dt):
"""Return a string with local timezone representing the date.
If python version is lower than 3.6, the time zone is not included.
"""
try:
return dt.astimezone().strftime('%Y-%m-%d %H:%M %z')
except (TypeError, ValueError):
# Datetime.astimezone in Python 3.5 can not handle naive datetime
return dt.strftime('%Y-%m-%d %H:%M')
def import_local_file(modname, modfile=None):
"""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. `modfile` is the file to
import if it isn't in the current directory.
"""
try:
import importlib.util as importlib_util
except ImportError:
importlib_util = None
if modfile is None:
modfile = modname + '.py'
if importlib_util:
spec = importlib_util.spec_from_file_location(modname, modfile)
mod = importlib_util.module_from_spec(spec)
sys.modules[modname] = mod
spec.loader.exec_module(mod)
else:
for suff in imp.get_suffixes(): # pragma: part covered
if suff[0] == '.py':
break
with open(modfile, 'r') as f:
# pylint: disable=undefined-loop-variable
mod = imp.load_module(modname, f, modfile, suff)
return mod
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