[SPARK-4897] [PySpark] Python 3 support

This PR update PySpark to support Python 3 (tested with 3.4).

Known issue: unpickle array from Pyrolite is broken in Python 3, those tests are skipped.

TODO: ec2/spark-ec2.py is not fully tested with python3.

Author: Davies Liu <davies@databricks.com>
Author: twneale <twneale@gmail.com>
Author: Josh Rosen <joshrosen@databricks.com>

Closes #5173 from davies/python3 and squashes the following commits:

d7d6323 [Davies Liu] fix tests
6c52a98 [Davies Liu] fix mllib test
99e334f [Davies Liu] update timeout
b716610 [Davies Liu] Merge branch 'master' of github.com:apache/spark into python3
cafd5ec [Davies Liu] adddress comments from @mengxr
bf225d7 [Davies Liu] Merge branch 'master' of github.com:apache/spark into python3
179fc8d [Davies Liu] tuning flaky tests
8c8b957 [Davies Liu] fix ResourceWarning in Python 3
5c57c95 [Davies Liu] Merge branch 'master' of github.com:apache/spark into python3
4006829 [Davies Liu] fix test
2fc0066 [Davies Liu] add python3 path
71535e9 [Davies Liu] fix xrange and divide
5a55ab4 [Davies Liu] Merge branch 'master' of github.com:apache/spark into python3
125f12c [Davies Liu] Merge branch 'master' of github.com:apache/spark into python3
ed498c8 [Davies Liu] fix compatibility with python 3
820e649 [Davies Liu] Merge branch 'master' of github.com:apache/spark into python3
e8ce8c9 [Davies Liu] Merge branch 'master' of github.com:apache/spark into python3
ad7c374 [Davies Liu] fix mllib test and warning
ef1fc2f [Davies Liu] fix tests
4eee14a [Davies Liu] Merge branch 'master' of github.com:apache/spark into python3
20112ff [Davies Liu] Merge branch 'master' of github.com:apache/spark into python3
59bb492 [Davies Liu] fix tests
1da268c [Davies Liu] Merge branch 'master' of github.com:apache/spark into python3
ca0fdd3 [Davies Liu] fix code style
9563a15 [Davies Liu] add imap back for python 2
0b1ec04 [Davies Liu] make python examples work with Python 3
d2fd566 [Davies Liu] Merge branch 'master' of github.com:apache/spark into python3
a716d34 [Davies Liu] test with python 3.4
f1700e8 [Davies Liu] fix test in python3
671b1db [Davies Liu] fix test in python3
692ff47 [Davies Liu] fix flaky test
7b9699f [Davies Liu] invalidate import cache for Python 3.3+
9c58497 [Davies Liu] fix kill worker
309bfbf [Davies Liu] keep compatibility
5707476 [Davies Liu] cleanup, fix hash of string in 3.3+
8662d5b [Davies Liu] Merge branch 'master' of github.com:apache/spark into python3
f53e1f0 [Davies Liu] fix tests
70b6b73 [Davies Liu] compile ec2/spark_ec2.py in python 3
a39167e [Davies Liu] support customize class in __main__
814c77b [Davies Liu] run unittests with python 3
7f4476e [Davies Liu] mllib tests passed
d737924 [Davies Liu] pass ml tests
375ea17 [Davies Liu] SQL tests pass
6cc42a9 [Davies Liu] rename
431a8de [Davies Liu] streaming tests pass
78901a7 [Davies Liu] fix hash of serializer in Python 3
24b2f2e [Davies Liu] pass all RDD tests
35f48fe [Davies Liu] run future again
1eebac2 [Davies Liu] fix conflict in ec2/spark_ec2.py
6e3c21d [Davies Liu] make cloudpickle work with Python3
2fb2db3 [Josh Rosen] Guard more changes behind sys.version; still doesn't run
1aa5e8f [twneale] Turned out `pickle.DictionaryType is dict` == True, so swapped it out
7354371 [twneale] buffer --> memoryview  I'm not super sure if this a valid change, but the 2.7 docs recommend using memoryview over buffer where possible, so hoping it'll work.
b69ccdf [twneale] Uses the pure python pickle._Pickler instead of c-extension _pickle.Pickler. It appears pyspark 2.7 uses the pure python pickler as well, so this shouldn't degrade pickling performance (?).
f40d925 [twneale] xrange --> range
e104215 [twneale] Replaces 2.7 types.InstsanceType with 3.4 `object`....could be horribly wrong depending on how types.InstanceType is used elsewhere in the package--see http://bugs.python.org/issue8206
79de9d0 [twneale] Replaces python2.7 `file` with 3.4 _io.TextIOWrapper
2adb42d [Josh Rosen] Fix up some import differences between Python 2 and 3
854be27 [Josh Rosen] Run `futurize` on Python code:
7c5b4ce [Josh Rosen] Remove Python 3 check in shell.py.

1 files changed, 7 insertions, 4 deletions

diff --git a/python/pyspark/sql/tests.py b/python/pyspark/sql/tests.py
index b3a6a2c6a9..7c09a0cfe3 100644
--- a/python/pyspark/sql/tests.py
+++ b/python/pyspark/sql/tests.py
@@ -157,13 +157,13 @@ class SQLTests(ReusedPySparkTestCase):
         self.assertEqual(4, res[0])
 
     def test_udf_with_array_type(self):
-        d = [Row(l=range(3), d={"key": range(5)})]
+        d = [Row(l=list(range(3)), d={"key": list(range(5))})]
         rdd = self.sc.parallelize(d)
         self.sqlCtx.createDataFrame(rdd).registerTempTable("test")
         self.sqlCtx.registerFunction("copylist", lambda l: list(l), ArrayType(IntegerType()))
         self.sqlCtx.registerFunction("maplen", lambda d: len(d), IntegerType())
         [(l1, l2)] = self.sqlCtx.sql("select copylist(l), maplen(d) from test").collect()
-        self.assertEqual(range(3), l1)
+        self.assertEqual(list(range(3)), l1)
         self.assertEqual(1, l2)
 
     def test_broadcast_in_udf(self):
@@ -266,7 +266,7 @@ class SQLTests(ReusedPySparkTestCase):
 
     def test_apply_schema(self):
         from datetime import date, datetime
-        rdd = self.sc.parallelize([(127, -128L, -32768, 32767, 2147483647L, 1.0,
+        rdd = self.sc.parallelize([(127, -128, -32768, 32767, 2147483647, 1.0,
                                     date(2010, 1, 1), datetime(2010, 1, 1, 1, 1, 1),
                                     {"a": 1}, (2,), [1, 2, 3], None)])
         schema = StructType([
@@ -309,7 +309,7 @@ class SQLTests(ReusedPySparkTestCase):
     def test_struct_in_map(self):
         d = [Row(m={Row(i=1): Row(s="")})]
         df = self.sc.parallelize(d).toDF()
-        k, v = df.head().m.items()[0]
+        k, v = list(df.head().m.items())[0]
         self.assertEqual(1, k.i)
         self.assertEqual("", v.s)
 
@@ -554,6 +554,9 @@ class HiveContextSQLTests(ReusedPySparkTestCase):
         except py4j.protocol.Py4JError:
             cls.sqlCtx = None
             return
+        except TypeError:
+            cls.sqlCtx = None
+            return
         os.unlink(cls.tempdir.name)
         _scala_HiveContext =\
             cls.sc._jvm.org.apache.spark.sql.hive.test.TestHiveContext(cls.sc._jsc.sc())