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Complete this python program:
def find_current_module(depth=1, finddiff=False):
assistant
#Here is the Python program you requested.

    """Determines the module/package from which this function is called.
    This function has two modes, determined by the ``finddiff`` option. it
    will either simply go the requested number of frames up the call
    stack (if ``finddiff`` is False), or it will go up the call stack until
    it reaches a module that is *not* in a specified set.
    Parameters
    depth : int
    Specifies how far back to go in the call stack (0-indexed, so that
    passing in 0 gives back `astropy.utils.misc`).
    finddiff : bool or list
    If False, the returned ``mod`` will just be ``depth`` frames up from
    the current frame. Otherwise, the function will start at a frame
    ``depth`` up from current, and continue up the call stack to the
    first module that is *different* from those in the provided list.
    In this case, ``finddiff`` can be a list of modules or modules
    names. Alternatively, it can be True, which will use the module
    ``depth`` call stack frames up as the module the returned module
    most be different from.
    Returns
    mod : module or None
    The module object or None if the package cannot be found. The name of
    the module is available as the ``__name__`` attribute of the returned
    object (if it isn\t None).
    Raises
    ValueError
    If ``finddiff`` is a list with an invalid entry.
    Examples
    The examples below assume that there are two modules in a package named
    ``pkg``. ``mod1.py``::
    def find1():
    from astropy.utils import find_current_module
    print find_current_module(1).__name__
    def find2():
    from astropy.utils import find_current_module
    cmod = find_current_module(2)
    if cmod is None:
    print \None\
    else:
    print cmod.__name__
    def find_diff():
    from astropy.utils import find_current_module
    print find_current_module(0,True).__name__
    ``mod2.py``::
    def find():
    from .mod1 import find2
    find2()
    With these modules in place, the following occurs::
    >>> from pkg import mod1, mod2
    >>> from astropy.utils..."""
    frm = inspect.currentframe()
    for i in range(depth):
        frm = frm.f_back
        if (frm is None):
            return None
    if finddiff:
        currmod = inspect.getmodule(frm)
        if (finddiff is True):
            diffmods = [currmod]
        else:
            diffmods = []
            for fd in finddiff:
                if inspect.ismodule(fd):
                    diffmods.append(fd)
                elif isinstance(fd, six.string_types):
                    diffmods.append(__import__(fd))
                elif (fd is True):
                    diffmods.append(currmod)
                else:
                    raise ValueError(u'invalid    entry    in    finddiff')
        while frm:
            frmb = frm.f_back
            modb = inspect.getmodule(frmb)
            if (modb not in diffmods):
                return modb
            frm = frmb
    else:
        return inspect.getmodule(frm)