from hachoir_core.error import HachoirError
from hachoir_core.stream import InputIOStream
from hachoir_parser import guessParser
from hachoir_Metadata import extractMetadata
def Metadata_for_filelike(filelike):
    try:
        filelike.seek(0)
    except (AttributeError,IOError):
        return None
    stream = InputIOStream(filelike,None,tags=[])
    parser = guessParser(stream)
    if not parser:
        return None
    try:
        Metadata = extractMetadata(parser)
    except HachoirError:
        return None
    return Metadata

只需要更好的错误处理:)