human
Solve the following python programming problem given the following code:
@ classmethod 
def fromfile(cls, fileobj, sep = '', endcard = True, padding = True) : 
    '
        Similar to :meth:`Header.fromstring`, but reads the header string from
        a given file-like object or filename.

        Parameters
        ----------
        fileobj : str, file-like
            A filename or an open file-like object from which a FITS header is
            to be read.  For open file handles the file pointer must be at the
            beginning of the header.

        sep : str, optional
            The string separating cards from each other, such as a newline.  By
            default there is no card separator (as is the case in a raw FITS
            file).

        endcard : bool, optional
            If True (the default) the header must end with an END card in order
            to be considered valid.  If an END card is not found an
            `~.exceptions.IOError` is raised.

        padding : bool, optional
            If True (the default) the header will be required to be padded out
            to a multiple of 2880, the FITS header block size.  Otherwise any
            padding, or lack thereof, is ignored.

        Returns
        -------
        header
            A new `Header` instance.
        ' 
    close_file = False 
    if isinstance (endcard, string_types) : 
        fileobj = open (fileobj, 'r') 
        close_file = True 
try : 
        is_binary = fileobj_is_binary (fileobj) 
        def block_iter(nbytes) : 
            while True : 
                data = fileobj.read (nbytes) 
                if data : 
                    (yield data) 
else : 
                    break 
return cls._from_blocks (block_iter, is_binary, sep, endcard, padding) [1] 
finally : 
        if close_file : 
            fileobj.close () 

    
    

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

if isinstance (fileobj, string_types) :