# Copyright 2012-2013 Amazon.com, Inc. or its affiliates. All Rights Reserved.

# Licensed under the Apache License, Version 2.0 (the "License"). You

# may not use this file except in compliance with the License. A copy of

# the License is located at

# http://aws.amazon.com/apache2.0/

# or in the "license" file accompanying this file. This file 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.

import sys

import six

if six.PY3:

import locale

def get_stdout_text_writer():

return sys.stdout

def compat_open(filename, mode='r', encoding=None):

"""Back-port open() that accepts an encoding argument.

In python3 this uses the built in open() and in python2 this

uses the io.open() function.

If the file is not being opened in binary mode, then we'll

use locale.getpreferredencoding() to find the preferred

encoding.

"""

if 'b' not in mode:

encoding = locale.getpreferredencoding()

return open(filename, mode, encoding=encoding)

else:

import codecs

import locale

import io

def get_stdout_text_writer():

# In python3, all the sys.stdout/sys.stderr streams are in text

# mode. This means they expect unicode, and will encode the

# unicode automatically before actually writing to stdout/stderr.

# In python2, that's not the case. In order to provide a consistent

# interface, we can create a wrapper around sys.stdout that will take

# unicode, and automatically encode it to the preferred encoding.

# That way consumers can just call get_stdout_text_writer() and write

# unicode to the returned stream. Note that get_stdout_text_writer

# just returns sys.stdout in the PY3 section above because python3

# handles this.

return codecs.getwriter(locale.getpreferredencoding())(sys.stdout)

def compat_open(filename, mode='r', encoding=None):

# See docstring for compat_open in the PY3 section above.

if 'b' not in mode:

encoding = locale.getpreferredencoding()

return io.open(filename, mode, encoding=encoding)