class_docstr: A simple timer.
class_docstr_tok: ["A","simple","timer","."]
code: def __exit__(self, unused_type, unused_value, unused_traceback):
      del unused_type, unused_value, unused_traceback
      self.end_time = time.time()
  
file_path: tf-quant-finance/tf_quant_finance/examples/demos/option_pricing_basic/pricer/app/pricers.py
imports: import datetime
  import time
  import numpy
  import tensorflow
  import tf_quant_finance
label_desc: Use image node_id 3 for calling the Timer obj's underlying member method code with example usage: obj.__exit__(unused_type, unused_value, unused_traceback) without return types