[SPARK-7711] Add a startTime property to match the corresponding one in Scala

Author: Holden Karau <[email protected]>

Closes #6275 from holdenk/SPARK-771-startTime-is-missing-from-pyspark and squashes the following commits:

06662dc [Holden Karau] add mising blank line for style checks
7a87410 [Holden Karau] add back missing newline
7a7876b [Holden Karau] Add a startTime property to match the corresponding one in the Scala SparkContext

(cherry picked from commit 6b18cdc)
Signed-off-by: Josh Rosen <[email protected]>

Author: holdenk

python/pyspark/context.py

@@ -291,6 +291,11 @@ def version(self):
         """
         return self._jsc.version()
 
+    @property
+    def startTime(self):
+        """Return the epoch time when the Spark Context was started."""
+        return self._jsc.startTime()
+
     @property
     def defaultParallelism(self):
         """

python/pyspark/tests.py

@@ -1809,6 +1809,10 @@ def run():
 
             sc.stop()
 
+    def test_startTime(self):
+        with SparkContext() as sc:
+            self.assertGreater(sc.startTime, 0)
+
 
 @unittest.skipIf(not _have_scipy, "SciPy not installed")
 class SciPyTests(PySparkTestCase):