import sys

try:
    from collections.abc import Iterable
except ImportError:
    from collections import Iterable  # noqa

PY3 = sys.version_info[0] == 3

XRANGE = range if PY3 else xrange  # noqa
INT = (int,) if PY3 else (int, long)  # noqa

if PY3:
    import builtins
    exec_ = getattr(builtins, "exec")

    def reraise(tp, value, tb=None):
        try:
            if value is None:
                value = tp()
            if value.__traceback__ is not tb:
                raise value.with_traceback(tb)
            raise value
        finally:
            value = None
            tb = None

else:
    def exec_(_code_, _globs_=None, _locs_=None):
        """Execute code in a namespace."""
        if _globs_ is None:
            frame = sys._getframe(1)
            _globs_ = frame.f_globals
            if _locs_ is None:
                _locs_ = frame.f_locals
            del frame
        elif _locs_ is None:
            _locs_ = _globs_
        exec("""exec _code_ in _globs_, _locs_""")

    exec_("""def reraise(tp, value, tb=None):
    try:
        raise tp, value, tb
    finally:
        tb = None
""")