Print out billable seconds after training completes (#30)

* Added: print out billable seconds after training completes

* Fixed: test_session.py to pass unit tests

* Fixed: removed offending tzlocal()

src/sagemaker/session.py

@@ -645,6 +645,9 @@ def logs_for_job(self, job_name, wait=False, poll=5):  # noqa: C901 - suppress c
             if dot:
                 print()
             print('===== Job Complete =====')
+            # Customers are not billed for hardware provisioning, so billable time is less than total time
+            billable_time = (description['TrainingEndTime'] - description['TrainingStartTime']) * instance_count
+            print('Billable seconds:', int(billable_time.total_seconds()) + 1)
 
 
 def container_def(image, model_data_url=None, env=None):

tests/unit/test_session.py

@@ -16,6 +16,7 @@
 from mock import Mock, patch, call
 import sagemaker
 from sagemaker import s3_input, Session, get_execution_role
+import datetime
 
 from botocore.exceptions import ClientError
 
@@ -177,6 +178,11 @@ def test_s3_input_all_arguments():
     {'ModelArtifacts': {
         'S3ModelArtifacts': S3_OUTPUT + '/model/model.tar.gz'
     }})
+# TrainingStartTime and TrainingEndTime are for billable seconds calculation
+COMPLETED_DESCRIBE_JOB_RESULT.update(
+    {'TrainingStartTime': datetime.datetime(2018, 2, 17, 7, 15, 0, 103000)})
+COMPLETED_DESCRIBE_JOB_RESULT.update(
+    {'TrainingEndTime': datetime.datetime(2018, 2, 17, 7, 19, 34, 953000)})
 IN_PROGRESS_DESCRIBE_JOB_RESULT = dict(DEFAULT_EXPECTED_TRAIN_JOB_ARGS)
 IN_PROGRESS_DESCRIBE_JOB_RESULT.update({'TrainingJobStatus': 'InProgress'})