import sys


PY2 = sys.version_info < (3, 0)
PY36 = sys.version_info >= (3, 6)
PYPY = hasattr(sys, "pypy_version_info")

_HAS_FOLD = PY36


try:  # Python 2
    long = long
    unicode = unicode
    basestring = basestring
except NameError:  # Python 3
    long = int
    unicode = str
    basestring = str


def decode(string, encodings=None):
    if not PY2 and not isinstance(string, bytes):
        return string

    if PY2 and isinstance(string, unicode):
        return string

    encodings = encodings or ["utf-8", "latin1", "ascii"]

    for encoding in encodings:
        try:
            return string.decode(encoding)
        except (UnicodeEncodeError, UnicodeDecodeError):
            pass

    return string.decode(encodings[0], errors="ignore")


def encode(string, encodings=None):
    if not PY2 and isinstance(string, bytes):
        return string

    if PY2 and isinstance(string, str):
        return string

    encodings = encodings or ["utf-8", "latin1", "ascii"]

    for encoding in encodings:
        try:
            return string.encode(encoding)
        except (UnicodeEncodeError, UnicodeDecodeError):
            pass

    return string.encode(encodings[0], errors="ignore")