how can use the fields in the class in python : `
class TPCANTimestamp (Structure):
    """
    Represents a timestamp of a received PCAN message
    Total Microseconds = micros + 1000 * millis + 0x100000000 * 1000 * millis_overflow
    """
    _fields_ = [ ("millis", c_uint),           # Base-value: milliseconds: 0.. 2^32-1
                 ("millis_overflow", c_ushort), # Roll-arounds of millis
                 ("micros", c_ushort) ]`

How can  i use the fileds in the TPCANTimestamp  class ??