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Editing: i18n.py

#   Copyright (c) 2021, Oracle and/or its affiliates. All rights reserved.
#   Licensed under the Universal Permissive License v 1.0 as shown at https://opensource.org/licenses/UPL.

from sys import version_info

try:
    PY3 = version_info.major >= 3
except AttributeError:
    PY3 = False

def ustr(obj):
    # converts object to unicode like object
    if PY3: # python3
        if isinstance(obj, str):
            return obj
        else:
            return str(obj, 'utf8', errors='ignore')
    else: # python2
        if isinstance(obj, unicode):
            return obj
        return unicode(obj, 'utf8', 'ignore')

def bstr(obj):
    # converts object to bytes like object
    if PY3: # python3
        if isinstance(obj, bytes):
            return obj
        else:
            return bytes(obj, 'utf8', errors='ignore')
    else: # python2
        if isinstance(obj, str):
            return obj
        return str(obj.encode('utf8', 'ignore'))

def sstr(obj):
    # converts object to string
    if PY3: # python3
        if isinstance(obj, str):
            return obj
        else:
            return str(obj, 'utf8', errors='ignore')
    else: # python2
        if isinstance(obj, str):
            return obj
        return str(obj.encode('utf8', 'ignore'))

def idn_puny_to_unicode(hostname):
    """ Convert Internationalized domain name from Punycode (RFC3492) to Unicode """
    if hostname is None:
        return None
    else:
        hostname = bstr(hostname)
        return hostname.decode('idna')

def idn_ascii_to_puny(hostname):
    """ Convert domain name to Punycode (RFC3492). Hostname can be instance of string or Unicode """
    if hostname is None:
        return None
    else:
        hostname = ustr(hostname)
        return hostname.encode('idna')

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