Repository: incubator-beam
Updated Branches:
  refs/heads/python-sdk df7ecd55f -> 5ab5567ea


Enables unused-import and used-before-assignment rules

Also cleans up some left over lint warnings from previous iterations.


Project: http://git-wip-us.apache.org/repos/asf/incubator-beam/repo
Commit: http://git-wip-us.apache.org/repos/asf/incubator-beam/commit/2094e009
Tree: http://git-wip-us.apache.org/repos/asf/incubator-beam/tree/2094e009
Diff: http://git-wip-us.apache.org/repos/asf/incubator-beam/diff/2094e009

Branch: refs/heads/python-sdk
Commit: 2094e0090bf98933c08c835c15958fc01512730c
Parents: bff9801
Author: Ahmet Altay <[email protected]>
Authored: Thu Jun 30 14:47:20 2016 -0700
Committer: Ahmet Altay <[email protected]>
Committed: Thu Jun 30 14:47:20 2016 -0700

----------------------------------------------------------------------
 sdks/python/.pylintrc                               |  2 --
 sdks/python/apache_beam/coders/coder_impl.py        |  1 -
 .../apache_beam/examples/complete/autocomplete.py   |  2 +-
 .../examples/complete/autocomplete_test.py          |  6 +-----
 .../apache_beam/examples/complete/estimate_pi.py    |  4 ++--
 sdks/python/apache_beam/examples/complete/tfidf.py  |  6 +++---
 .../examples/complete/top_wikipedia_sessions.py     |  9 +++++----
 .../examples/cookbook/bigquery_side_input.py        |  6 +++---
 .../examples/cookbook/bigquery_side_input_test.py   | 10 +++++-----
 .../examples/cookbook/bigquery_tornadoes_test.py    |  2 +-
 sdks/python/apache_beam/examples/cookbook/coders.py | 11 +++++------
 .../python/apache_beam/examples/cookbook/filters.py |  4 ++--
 .../apache_beam/examples/cookbook/filters_test.py   |  2 +-
 .../apache_beam/examples/cookbook/mergecontacts.py  | 16 ++++++++--------
 .../examples/cookbook/multiple_output_pardo.py      |  8 +++++---
 sdks/python/apache_beam/internal/json_value_test.py |  1 -
 sdks/python/apache_beam/transforms/core.py          |  3 ---
 sdks/python/apache_beam/transforms/ptransform.py    |  1 -
 sdks/python/apache_beam/transforms/util.py          |  3 ---
 sdks/python/apache_beam/transforms/window.py        |  2 +-
 20 files changed, 43 insertions(+), 56 deletions(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/incubator-beam/blob/2094e009/sdks/python/.pylintrc
----------------------------------------------------------------------
diff --git a/sdks/python/.pylintrc b/sdks/python/.pylintrc
index b283f04..c138f1a 100644
--- a/sdks/python/.pylintrc
+++ b/sdks/python/.pylintrc
@@ -124,9 +124,7 @@ disable =
   unnecessary-lambda,
   unneeded-not,
   unused-argument,
-  unused-import,
   unused-wildcard-import,
-  used-before-assignment,
   wildcard-import,
 
 

http://git-wip-us.apache.org/repos/asf/incubator-beam/blob/2094e009/sdks/python/apache_beam/coders/coder_impl.py
----------------------------------------------------------------------
diff --git a/sdks/python/apache_beam/coders/coder_impl.py 
b/sdks/python/apache_beam/coders/coder_impl.py
index a623f2b..8ff73bf 100644
--- a/sdks/python/apache_beam/coders/coder_impl.py
+++ b/sdks/python/apache_beam/coders/coder_impl.py
@@ -26,7 +26,6 @@ coder_impl.pxd file for type hints.
 """
 
 import collections
-from cPickle import loads, dumps
 
 
 # pylint: disable=wrong-import-order, wrong-import-position

http://git-wip-us.apache.org/repos/asf/incubator-beam/blob/2094e009/sdks/python/apache_beam/examples/complete/autocomplete.py
----------------------------------------------------------------------
diff --git a/sdks/python/apache_beam/examples/complete/autocomplete.py 
b/sdks/python/apache_beam/examples/complete/autocomplete.py
index 616a2c9..2fb2d92 100644
--- a/sdks/python/apache_beam/examples/complete/autocomplete.py
+++ b/sdks/python/apache_beam/examples/complete/autocomplete.py
@@ -44,7 +44,7 @@ def run(argv=None):
    | beam.FlatMap('split', lambda x: re.findall(r'[A-Za-z\']+', x))
    | TopPerPrefix('TopPerPrefix', 5)
    | beam.Map('format',
-            lambda (prefix, candidates): '%s: %s' % (prefix, candidates))
+              lambda (prefix, candidates): '%s: %s' % (prefix, candidates))
    | beam.io.Write('write', beam.io.TextFileSink(known_args.output)))
   p.run()
 

http://git-wip-us.apache.org/repos/asf/incubator-beam/blob/2094e009/sdks/python/apache_beam/examples/complete/autocomplete_test.py
----------------------------------------------------------------------
diff --git a/sdks/python/apache_beam/examples/complete/autocomplete_test.py 
b/sdks/python/apache_beam/examples/complete/autocomplete_test.py
index 706c4c8..bd0a6cb 100644
--- a/sdks/python/apache_beam/examples/complete/autocomplete_test.py
+++ b/sdks/python/apache_beam/examples/complete/autocomplete_test.py
@@ -18,16 +18,12 @@
 """Test for the wordcount example."""
 
 import collections
-import logging
-import re
-import tempfile
 import unittest
 
 
 import apache_beam as beam
 from apache_beam.examples.complete import autocomplete
 from apache_beam.pvalue import AsIter
-from apache_beam.utils import options
 
 # TODO(robertwb): Move to testing utilities.
 
@@ -41,7 +37,7 @@ def assert_that(pcoll, matcher):
   def check_matcher(_, side_value):
     assert matcher(side_value)
     return []
-  singleton | beam.FlatMap(check_matcher, AsIter(pcoll))
+  singleton | beam.FlatMap(check_matcher, AsIter(pcoll))  # pylint: 
disable=expression-not-assigned
 
 
 def contains_in_any_order(expected):

http://git-wip-us.apache.org/repos/asf/incubator-beam/blob/2094e009/sdks/python/apache_beam/examples/complete/estimate_pi.py
----------------------------------------------------------------------
diff --git a/sdks/python/apache_beam/examples/complete/estimate_pi.py 
b/sdks/python/apache_beam/examples/complete/estimate_pi.py
index d6ae619..8b0f202 100644
--- a/sdks/python/apache_beam/examples/complete/estimate_pi.py
+++ b/sdks/python/apache_beam/examples/complete/estimate_pi.py
@@ -100,8 +100,8 @@ def run(argv=None):
    | beam.Map('Run trials', run_trials)
    | beam.CombineGlobally('Sum', combine_results).without_defaults()
    | beam.io.Write('Write',
-                 beam.io.TextFileSink(known_args.output,
-                                    coder=JsonCoder())))
+                   beam.io.TextFileSink(known_args.output,
+                                        coder=JsonCoder())))
 
   # Actually run the pipeline (all operations above are deferred).
   p.run()

http://git-wip-us.apache.org/repos/asf/incubator-beam/blob/2094e009/sdks/python/apache_beam/examples/complete/tfidf.py
----------------------------------------------------------------------
diff --git a/sdks/python/apache_beam/examples/complete/tfidf.py 
b/sdks/python/apache_beam/examples/complete/tfidf.py
index 1447f5d..cd85651 100644
--- a/sdks/python/apache_beam/examples/complete/tfidf.py
+++ b/sdks/python/apache_beam/examples/complete/tfidf.py
@@ -98,7 +98,7 @@ class TfIdf(beam.PTransform):
     uri_to_word_and_count = (
         uri_and_word_to_count
         | beam.Map('shift keys',
-                 lambda ((uri, word), count): (uri, (word, count))))
+                   lambda ((uri, word), count): (uri, (word, count))))
 
     # Perform a CoGroupByKey (a sort of pre-join) on the prepared
     # uri_to_word_total and uri_to_word_and_count tagged by 'word totals' and
@@ -146,8 +146,8 @@ class TfIdf(beam.PTransform):
     word_to_df = (
         word_to_doc_count
         | beam.Map('compute doc frequencies',
-                 lambda (word, count), total: (word, float(count) / total),
-                 AsSingleton(total_documents)))
+                   lambda (word, count), total: (word, float(count) / total),
+                   AsSingleton(total_documents)))
 
     # Join the term frequency and document frequency collections,
     # each keyed on the word.

http://git-wip-us.apache.org/repos/asf/incubator-beam/blob/2094e009/sdks/python/apache_beam/examples/complete/top_wikipedia_sessions.py
----------------------------------------------------------------------
diff --git 
a/sdks/python/apache_beam/examples/complete/top_wikipedia_sessions.py 
b/sdks/python/apache_beam/examples/complete/top_wikipedia_sessions.py
index 2209f80..55b7857 100644
--- a/sdks/python/apache_beam/examples/complete/top_wikipedia_sessions.py
+++ b/sdks/python/apache_beam/examples/complete/top_wikipedia_sessions.py
@@ -76,7 +76,7 @@ class ComputeSessions(beam.PTransform):
   def apply(self, pcoll):
     return (pcoll
             | beam.WindowInto('ComputeSessionsWindow',
-                            window.Sessions(gap_size=ONE_HOUR_IN_SECONDS))
+                              window.Sessions(gap_size=ONE_HOUR_IN_SECONDS))
             | combiners.Count.PerElement())
 
 
@@ -89,8 +89,8 @@ class TopPerMonth(beam.PTransform):
   def apply(self, pcoll):
     return (pcoll
             | beam.WindowInto('TopPerMonthWindow',
-                            window.FixedWindows(
-                                size=THIRTY_DAYS_IN_SECONDS))
+                              window.FixedWindows(
+                                  size=THIRTY_DAYS_IN_SECONDS))
             | combiners.core.CombineGlobally(
                 'Top',
                 combiners.TopCombineFn(
@@ -126,7 +126,8 @@ class ComputeTopSessions(beam.PTransform):
 
   def apply(self, pcoll):
     return (pcoll
-            | beam.ParDo('ExtractUserAndTimestamp', 
ExtractUserAndTimestampDoFn())
+            | beam.ParDo('ExtractUserAndTimestamp',
+                         ExtractUserAndTimestampDoFn())
             | beam.Filter(
                 lambda x: abs(hash(x)) <= sys.maxint * self.sampling_threshold)
             | ComputeSessions()

http://git-wip-us.apache.org/repos/asf/incubator-beam/blob/2094e009/sdks/python/apache_beam/examples/cookbook/bigquery_side_input.py
----------------------------------------------------------------------
diff --git a/sdks/python/apache_beam/examples/cookbook/bigquery_side_input.py 
b/sdks/python/apache_beam/examples/cookbook/bigquery_side_input.py
index 65fe815..c26f6cd 100644
--- a/sdks/python/apache_beam/examples/cookbook/bigquery_side_input.py
+++ b/sdks/python/apache_beam/examples/cookbook/bigquery_side_input.py
@@ -96,9 +96,9 @@ def run(argv=None):
   ignore_word = known_args.ignore_word
 
   pcoll_corpus = p | beam.Read('read corpus',
-                             beam.io.BigQuerySource(query=query_corpus))
+                               beam.io.BigQuerySource(query=query_corpus))
   pcoll_word = p | beam.Read('read words',
-                           beam.io.BigQuerySource(query=query_word))
+                             beam.io.BigQuerySource(query=query_word))
   pcoll_ignore_corpus = p | beam.Create('create_ignore_corpus', 
[ignore_corpus])
   pcoll_ignore_word = p | beam.Create('create_ignore_word', [ignore_word])
   pcoll_group_ids = p | beam.Create('create groups', group_ids)
@@ -108,7 +108,7 @@ def run(argv=None):
 
   # pylint:disable=expression-not-assigned
   pcoll_groups | beam.io.Write('WriteToText',
-                             beam.io.TextFileSink(known_args.output))
+                               beam.io.TextFileSink(known_args.output))
   p.run()
 
 

http://git-wip-us.apache.org/repos/asf/incubator-beam/blob/2094e009/sdks/python/apache_beam/examples/cookbook/bigquery_side_input_test.py
----------------------------------------------------------------------
diff --git 
a/sdks/python/apache_beam/examples/cookbook/bigquery_side_input_test.py 
b/sdks/python/apache_beam/examples/cookbook/bigquery_side_input_test.py
index 813a93a..c16518f 100644
--- a/sdks/python/apache_beam/examples/cookbook/bigquery_side_input_test.py
+++ b/sdks/python/apache_beam/examples/cookbook/bigquery_side_input_test.py
@@ -31,12 +31,12 @@ class BigQuerySideInputTest(unittest.TestCase):
 
     group_ids_pcoll = p | beam.Create('create_group_ids', ['A', 'B', 'C'])
     corpus_pcoll = p | beam.Create('create_corpus',
-                                 [{'f': 'corpus1'},
-                                  {'f': 'corpus2'},
-                                  {'f': 'corpus3'}])
+                                   [{'f': 'corpus1'},
+                                    {'f': 'corpus2'},
+                                    {'f': 'corpus3'}])
     words_pcoll = p | beam.Create('create_words', [{'f': 'word1'},
-                                                 {'f': 'word2'},
-                                                 {'f': 'word3'}])
+                                                   {'f': 'word2'},
+                                                   {'f': 'word3'}])
     ignore_corpus_pcoll = p | beam.Create('create_ignore_corpus', ['corpus1'])
     ignore_word_pcoll = p | beam.Create('create_ignore_word', ['word1'])
 

http://git-wip-us.apache.org/repos/asf/incubator-beam/blob/2094e009/sdks/python/apache_beam/examples/cookbook/bigquery_tornadoes_test.py
----------------------------------------------------------------------
diff --git 
a/sdks/python/apache_beam/examples/cookbook/bigquery_tornadoes_test.py 
b/sdks/python/apache_beam/examples/cookbook/bigquery_tornadoes_test.py
index 211b779..2547849 100644
--- a/sdks/python/apache_beam/examples/cookbook/bigquery_tornadoes_test.py
+++ b/sdks/python/apache_beam/examples/cookbook/bigquery_tornadoes_test.py
@@ -35,7 +35,7 @@ class BigQueryTornadoesTest(unittest.TestCase):
         {'month': 2, 'day': 1, 'tornado': True}]))
     results = bigquery_tornadoes.count_tornadoes(rows)
     beam.assert_that(results, beam.equal_to([{'month': 1, 'tornado_count': 2},
-                                         {'month': 2, 'tornado_count': 1}]))
+                                             {'month': 2, 'tornado_count': 
1}]))
     p.run()
 
 

http://git-wip-us.apache.org/repos/asf/incubator-beam/blob/2094e009/sdks/python/apache_beam/examples/cookbook/coders.py
----------------------------------------------------------------------
diff --git a/sdks/python/apache_beam/examples/cookbook/coders.py 
b/sdks/python/apache_beam/examples/cookbook/coders.py
index 0a27356..f5158c2 100644
--- a/sdks/python/apache_beam/examples/cookbook/coders.py
+++ b/sdks/python/apache_beam/examples/cookbook/coders.py
@@ -81,12 +81,11 @@ def run(argv=None):
   p = beam.Pipeline(argv=pipeline_args)
   (p  # pylint: disable=expression-not-assigned
    | beam.io.Read('read',
-                beam.io.TextFileSource(known_args.input,
-                                     coder=JsonCoder()))
-   | beam.FlatMap('points', compute_points) | beam.CombinePerKey(sum) | 
beam.io.Write(
-       'write',
-       beam.io.TextFileSink(known_args.output,
-                          coder=JsonCoder())))
+                  beam.io.TextFileSource(known_args.input, coder=JsonCoder()))
+   | beam.FlatMap('points', compute_points)
+   | beam.CombinePerKey(sum)
+   | beam.io.Write('write',
+                   beam.io.TextFileSink(known_args.output, coder=JsonCoder())))
   p.run()
 
 

http://git-wip-us.apache.org/repos/asf/incubator-beam/blob/2094e009/sdks/python/apache_beam/examples/cookbook/filters.py
----------------------------------------------------------------------
diff --git a/sdks/python/apache_beam/examples/cookbook/filters.py 
b/sdks/python/apache_beam/examples/cookbook/filters.py
index 8741d63..c309941 100644
--- a/sdks/python/apache_beam/examples/cookbook/filters.py
+++ b/sdks/python/apache_beam/examples/cookbook/filters.py
@@ -54,7 +54,7 @@ def filter_cold_days(input_data, month_filter):
   fields_of_interest = (
       input_data
       | beam.Map('projected',
-               lambda row: {f: row[f] for f in projection_fields}))
+                 lambda row: {f: row[f] for f in projection_fields}))
 
   # Compute the global mean temperature.
   global_mean = AsSingleton(
@@ -68,7 +68,7 @@ def filter_cold_days(input_data, month_filter):
       fields_of_interest
       | beam.Filter('desired month', lambda row: row['month'] == month_filter)
       | beam.Filter('below mean',
-                  lambda row, mean: row['mean_temp'] < mean, global_mean))
+                    lambda row, mean: row['mean_temp'] < mean, global_mean))
 
 
 def run(argv=None):

http://git-wip-us.apache.org/repos/asf/incubator-beam/blob/2094e009/sdks/python/apache_beam/examples/cookbook/filters_test.py
----------------------------------------------------------------------
diff --git a/sdks/python/apache_beam/examples/cookbook/filters_test.py 
b/sdks/python/apache_beam/examples/cookbook/filters_test.py
index bac5f73..cf1ca7e 100644
--- a/sdks/python/apache_beam/examples/cookbook/filters_test.py
+++ b/sdks/python/apache_beam/examples/cookbook/filters_test.py
@@ -47,7 +47,7 @@ class FiltersTest(unittest.TestCase):
     beam.assert_that(
         results,
         beam.equal_to([{'year': 2010, 'month': 1, 'day': 1, 'mean_temp': 3},
-                     {'year': 2012, 'month': 1, 'day': 2, 'mean_temp': 3}]))
+                       {'year': 2012, 'month': 1, 'day': 2, 'mean_temp': 3}]))
     results.pipeline.run()
 
   def test_basic_empty(self):

http://git-wip-us.apache.org/repos/asf/incubator-beam/blob/2094e009/sdks/python/apache_beam/examples/cookbook/mergecontacts.py
----------------------------------------------------------------------
diff --git a/sdks/python/apache_beam/examples/cookbook/mergecontacts.py 
b/sdks/python/apache_beam/examples/cookbook/mergecontacts.py
index 886171f..bf8f4d0 100644
--- a/sdks/python/apache_beam/examples/cookbook/mergecontacts.py
+++ b/sdks/python/apache_beam/examples/cookbook/mergecontacts.py
@@ -69,9 +69,9 @@ def run(argv=None, assert_results=None):
     return (p
             | beam.io.Read('read_%s' % label, textfile)
             | beam.Map('backslash_%s' % label,
-                     lambda x: re.sub(r'\\', r'\\\\', x))
+                       lambda x: re.sub(r'\\', r'\\\\', x))
             | beam.Map('escape_quotes_%s' % label,
-                     lambda x: re.sub(r'"', r'\"', x))
+                       lambda x: re.sub(r'"', r'\"', x))
             | beam.Map('split_%s' % label, lambda x: re.split(r'\t+', x, 1)))
 
   # Read input databases.
@@ -79,8 +79,8 @@ def run(argv=None, assert_results=None):
                            beam.io.TextFileSource(known_args.input_email))
   phone = read_kv_textfile('phone',
                            beam.io.TextFileSource(known_args.input_phone))
-  snailmail = read_kv_textfile('snailmail',
-                               
beam.io.TextFileSource(known_args.input_snailmail))
+  snailmail = read_kv_textfile('snailmail', beam.io.TextFileSource(
+      known_args.input_snailmail))
 
   # Group together all entries under the same name.
   grouped = (email, phone, snailmail) | beam.CoGroupByKey('group_by_name')
@@ -109,17 +109,17 @@ def run(argv=None, assert_results=None):
   # Write tab-delimited output.
   # pylint: disable=expression-not-assigned
   tsv_lines | beam.io.Write('write_tsv',
-                          beam.io.TextFileSink(known_args.output_tsv))
+                            beam.io.TextFileSink(known_args.output_tsv))
 
   # TODO(silviuc): Move the assert_results logic to the unit test.
   if assert_results is not None:
     expected_luddites, expected_writers, expected_nomads = assert_results
     beam.assert_that(num_luddites, beam.equal_to([expected_luddites]),
-                   label='assert:luddites')
+                     label='assert:luddites')
     beam.assert_that(num_writers, beam.equal_to([expected_writers]),
-                   label='assert:writers')
+                     label='assert:writers')
     beam.assert_that(num_nomads, beam.equal_to([expected_nomads]),
-                   label='assert:nomads')
+                     label='assert:nomads')
   # Execute pipeline.
   p.run()
 

http://git-wip-us.apache.org/repos/asf/incubator-beam/blob/2094e009/sdks/python/apache_beam/examples/cookbook/multiple_output_pardo.py
----------------------------------------------------------------------
diff --git a/sdks/python/apache_beam/examples/cookbook/multiple_output_pardo.py 
b/sdks/python/apache_beam/examples/cookbook/multiple_output_pardo.py
index 861f95c..48b8b1e 100644
--- a/sdks/python/apache_beam/examples/cookbook/multiple_output_pardo.py
+++ b/sdks/python/apache_beam/examples/cookbook/multiple_output_pardo.py
@@ -153,18 +153,20 @@ def run(argv=None):
    | beam.Map('pair_with_key', lambda x: ('chars_temp_key', x))
    | beam.GroupByKey()
    | beam.Map('count chars', lambda (_, counts): sum(counts))
-   | beam.Write('write chars', beam.io.TextFileSink(known_args.output + 
'-chars')))
+   | beam.Write('write chars',
+                beam.io.TextFileSink(known_args.output + '-chars')))
 
   # pylint: disable=expression-not-assigned
   (short_words
    | CountWords('count short words')
    | beam.Write('write short words',
-              beam.io.TextFileSink(known_args.output + '-short-words')))
+                beam.io.TextFileSink(known_args.output + '-short-words')))
 
   # pylint: disable=expression-not-assigned
   (words
    | CountWords('count words')
-   | beam.Write('write words', beam.io.TextFileSink(known_args.output + 
'-words')))
+   | beam.Write('write words',
+                beam.io.TextFileSink(known_args.output + '-words')))
 
   p.run()
 

http://git-wip-us.apache.org/repos/asf/incubator-beam/blob/2094e009/sdks/python/apache_beam/internal/json_value_test.py
----------------------------------------------------------------------
diff --git a/sdks/python/apache_beam/internal/json_value_test.py 
b/sdks/python/apache_beam/internal/json_value_test.py
index f2ae0c1..ad2a394 100644
--- a/sdks/python/apache_beam/internal/json_value_test.py
+++ b/sdks/python/apache_beam/internal/json_value_test.py
@@ -20,7 +20,6 @@
 import unittest
 
 from apitools.base.py.extra_types import JsonValue
-from apitools.base.py.extra_types import JsonObject
 from apache_beam.internal.json_value import from_json_value
 from apache_beam.internal.json_value import to_json_value
 

http://git-wip-us.apache.org/repos/asf/incubator-beam/blob/2094e009/sdks/python/apache_beam/transforms/core.py
----------------------------------------------------------------------
diff --git a/sdks/python/apache_beam/transforms/core.py 
b/sdks/python/apache_beam/transforms/core.py
index 8f4c246..12c0a97 100644
--- a/sdks/python/apache_beam/transforms/core.py
+++ b/sdks/python/apache_beam/transforms/core.py
@@ -20,14 +20,11 @@
 from __future__ import absolute_import
 
 import copy
-import uuid
 
 from apache_beam import pvalue
 from apache_beam import typehints
 from apache_beam.coders import typecoders
 from apache_beam.internal import util
-from apache_beam.pvalue import AsIter
-from apache_beam.pvalue import AsSingleton
 from apache_beam.transforms import ptransform
 from apache_beam.transforms import window
 from apache_beam.transforms.ptransform import PTransform

http://git-wip-us.apache.org/repos/asf/incubator-beam/blob/2094e009/sdks/python/apache_beam/transforms/ptransform.py
----------------------------------------------------------------------
diff --git a/sdks/python/apache_beam/transforms/ptransform.py 
b/sdks/python/apache_beam/transforms/ptransform.py
index 106c44f..2b3ad32 100644
--- a/sdks/python/apache_beam/transforms/ptransform.py
+++ b/sdks/python/apache_beam/transforms/ptransform.py
@@ -42,7 +42,6 @@ import operator
 import os
 import sys
 
-from apache_beam import coders
 from apache_beam import error
 from apache_beam import pvalue
 from apache_beam import typehints

http://git-wip-us.apache.org/repos/asf/incubator-beam/blob/2094e009/sdks/python/apache_beam/transforms/util.py
----------------------------------------------------------------------
diff --git a/sdks/python/apache_beam/transforms/util.py 
b/sdks/python/apache_beam/transforms/util.py
index 87990a3..6b5b16c 100644
--- a/sdks/python/apache_beam/transforms/util.py
+++ b/sdks/python/apache_beam/transforms/util.py
@@ -20,9 +20,6 @@
 
 from __future__ import absolute_import
 
-import collections
-import operator
-
 from apache_beam.pvalue import AsIter as AllOf
 from apache_beam.transforms.core import CombinePerKey, Create, Flatten, 
GroupByKey, Map
 from apache_beam.transforms.ptransform import PTransform

http://git-wip-us.apache.org/repos/asf/incubator-beam/blob/2094e009/sdks/python/apache_beam/transforms/window.py
----------------------------------------------------------------------
diff --git a/sdks/python/apache_beam/transforms/window.py 
b/sdks/python/apache_beam/transforms/window.py
index e58cf3c..cc17bcf 100644
--- a/sdks/python/apache_beam/transforms/window.py
+++ b/sdks/python/apache_beam/transforms/window.py
@@ -369,7 +369,7 @@ class Sessions(WindowFn):
     to_merge = []
     for w in sorted(merge_context.windows, key=lambda w: w.start):
       if to_merge:
-        if end > w.start:
+        if end > w.start:  # pylint: disable=used-before-assignment
           to_merge.append(w)
           if w.end > end:
             end = w.end

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