import sys

# True if we are running on Python 3.
PY3 = sys.version_info[0] == 3

if PY3:  # pragma: no cover
    text_type = str
else:
    text_type = unicode


def bytes_(s, encoding='latin-1', errors='strict'):
    """ If ``s`` is an instance of ``text_type``, return
    ``s.encode(encoding, errors)``, otherwise return ``s``"""
    if isinstance(s, text_type):  # pragma: no cover
        return s.encode(encoding, errors)
    return s

if PY3:  # pragma: no cover
    def native_(s, encoding='latin-1', errors='strict'):
        """ If ``s`` is an instance of ``text_type``, return
        ``s``, otherwise return ``str(s, encoding, errors)``"""
        if isinstance(s, text_type):
            return s
        return str(s, encoding, errors)
else:
    def native_(s, encoding='latin-1', errors='strict'):  # noqa
        """ If ``s`` is an instance of ``text_type``, return
        ``s.encode(encoding, errors)``, otherwise return ``str(s)``"""
        if isinstance(s, text_type):
            return s.encode(encoding, errors)
        return str(s)

native_.__doc__ = """
Python 3: If ``s`` is an instance of ``text_type``, return ``s``, otherwise
return ``str(s, encoding, errors)``

Python 2: If ``s`` is an instance of ``text_type``, return
``s.encode(encoding, errors)``, otherwise return ``str(s)``
"""