class_docstr: A context object timer. Usage:
      >>> with Timer() as timer:
      ...     do_something()
      >>> print(timer.interval)
code: def __enter__(self):
      self.start = self.time()
      return self
  
imports: import time
label_desc: Use image node_id 2 for calling the Timer obj's underlying member method code with example usage: obj.__enter__() and returns: self