<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def base64_bytes(x):
 """Turn base64 into bytes"""

    if six.PY2:
        return base64.decodestring(x)
    return base64.decodebytes(bytes_encode(x))