def pack_into(fmt, buf, offset, *args, **kwargs):
return CompiledFormat(fmt).pack_into(buf,<EOL>offset,<EOL>*args,<EOL>**kwargs)<EOL>
Pack given values v1, v2, ... into given bytearray `buf`, starting
    at given bit offset `offset`. Pack according to given format
    string `fmt`. Give `fill_padding` as ``False`` to leave padding
    bits in `buf` unmodified.