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Solve the following python programming problem given the following code:
@ classmethod 
def _readfrom_internal(cls, data, header = None, checksum = False, ignore_missing_end = False, **kwargs) : 
    '
        Provides the bulk of the internal implementation for readfrom and
        fromstring.

        For some special cases, supports using a header that was already
        created, and just using the input data for the actual array data.
        ' 
    hdu_buffer = None 
    hdu_fileobj = None 
    header_offset = 0 
    if isinstance (header, _File) : 
        from_file = True 
        if (header is None) : 
            header_offset = data.tell () 
            header = Header.fromfile (data, endcard = (not ignore_missing_end)) 
hdu_fileobj = data 
        data_offset = data.tell () 
else : 
        from_file = False 
        try : 
            np.ndarray ((), dtype = 'ubyte', buffer = data) 
except TypeError : 
            raise TypeError (('The provided object %r does not contain an underlying memory buffer.  fromstring() requires an object that supports the buffer interface such as bytes, str (in Python 2.x but not in 3.x), buffer, memoryview, ndarray, etc.  This restriction is to ensure that efficient access to the array/table data is possible.' % data)) 
if (header is None) : 
            def block_iter(nbytes) : 
                idx = 0 
                while (idx < len (data)) : 
                    (yield data [idx : (idx + nbytes)]) 
                    idx += nbytes 
(header_str, header) = Header._from_blocks (block_iter, True, '', (not ignore_missing_end), True) 
            if (len (data) > len (header_str)) : 
                hdu_buffer = data 
else : 
            if data : 
                hdu_buffer = data 
header_offset = 0 
        data_offset = len (header_str) 
cls = _hdu_class_from_header (cls, header) 
    (args, varargs, varkwargs, defaults) = getargspec (cls.__init__) 
    new_kwargs = kwargs.copy () 
    if (not varkwargs) : 
        for key in kwargs : 
            if (key not in args) : 
                del new_kwargs [key] 
hdu = cls (data = DELAYED,...

    
    

    Fix the buggy line: if isinstance (header, _File) :
assistant
#Here is Python program to fix the buggy line: if isinstance (header, _File) :
.

if isinstance (data, _File) :