Function read_magic_number_from_file

xarray/core/utils.py:769–777

(filename_or_obj, count=8)

def read_magic_number_from_file(filename_or_obj, count=8) -> bytes:
    # check byte header to determine file type
    if not isinstance(filename_or_obj, io.IOBase):
        raise TypeError(f"cannot read the magic number from {type(filename_or_obj)}")
    if filename_or_obj.tell() != 0:
        filename_or_obj.seek(0)
    magic_number = filename_or_obj.read(count)
    filename_or_obj.seek(0)
    return magic_number


def try_read_magic_number_from_path(pathlike, count=8) -> bytes | None: