`astropy.io.fits.header:Header.fromfile`

source: /astropy/io/fits/header.py :467

Summary

Similar to Header.fromstring, but reads the header string from a given file-like object or filename.

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 OSError 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.