human
Here's a good function header given the following:
I wrote the below code

    def asBytes(s):
        if (type(s) is bytes):
            return s
        else:
            return s.encode('utf-8')
    def eventFromBytearray(record):
        try:
            text = bytes(record).decode('utf-8')
        except UnicodeDecodeError:
            log.error(u'Unable    to    decode    UTF-8    for    JSON    record:    {record!r}', record=bytes(record))
            return None
        try:
            return eventFromJSON(text)
        except ValueError:
            log.error(u'Unable    to    read    JSON    record:    {record!r}', record=bytes(record))
            return None
    if (recordSeparator is None):
        first = asBytes(inFile.read(1))
        if (first == '\x1e'):
            recordSeparator = first
        else:
            recordSeparator = ''
    else:
        recordSeparator = asBytes(recordSeparator)
        first = ''
    if (recordSeparator == ''):
        recordSeparator = '\n'
        eventFromRecord = eventFromBytearray
    else:
        def eventFromRecord(record):
            if (record[(-1)] == ord('\n')):
                return eventFromBytearray(record)
            else:
                log.error(u'Unable    to    read    truncated    JSON    record:    {record!r}', record=bytes(record))
            return None
    buffer = bytearray(first)
    while True:
        newData = inFile.read(bufferSize)
        if (not newData):
            if (len(buffer) > 0):
                event = eventFromRecord(buffer)
                if (event is not None):
                    (yield event)
            break
        buffer += asBytes(newData)
        records = buffer.split(recordSeparator)
        for record in records[:(-1)]:
            if (len(record) > 0):
                event = eventFromRecord(record)
                if (event is not None):
                    (yield event)
        buffer = records[(-1)]

What's a good function header?
assistant
#Here's a good function header.

def eventsFromJSONLogFile(inFile, recordSeparator=None, bufferSize=4096):