list of weak references to the object (if defined)
ctime(seconds) -> string
Convert a time in seconds since the Epoch to a string in local time.
This is equivalent to asctime(localtime(seconds)). When the time tuple is
not present, current time as returned by localtime() is used.
loads(string) -- Load a pickle from the given string
Delay execution for a given number of seconds.
The argument may be
a floating point number for subsecond precision.