util.py 文件源码

def write_value(fd, fmt, *value, **kwargs):
    """
    Write a single binary value to a file-like object.

    Parameters
    ----------
    fd : file-like object
        Must be opened for writing, in binary mode.

    fmt : str
        A `struct` module `format character
        <https://docs.python.org/2/library/struct.html#format-characters>`__
        string.

    value : any
        The value to encode and write to the file.

    endian : str
        The endianness. Must be ``>`` or ``<``.  Default: ``>``.
    """
    endian = kwargs.get('endian', '>')
    fmt = endian + fmt
    fd.write(struct.pack(fmt, *value))