Github user brennonyork commented on a diff in the pull request:

    https://github.com/apache/spark/pull/5694#discussion_r30630897
  
    --- Diff: dev/run-tests.py ---
    @@ -0,0 +1,418 @@
    +#!/usr/bin/env python
    +
    +#
    +# Licensed to the Apache Software Foundation (ASF) under one or more
    +# contributor license agreements.  See the NOTICE file distributed with
    +# this work for additional information regarding copyright ownership.
    +# The ASF licenses this file to You under the Apache License, Version 2.0
    +# (the "License"); you may not use this file except in compliance with
    +# the License.  You may obtain a copy of the License at
    +#
    +#    http://www.apache.org/licenses/LICENSE-2.0
    +#
    +# Unless required by applicable law or agreed to in writing, software
    +# distributed under the License is distributed on an "AS IS" BASIS,
    +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    +# See the License for the specific language governing permissions and
    +# limitations under the License.
    +#
    +
    +import os
    +import re
    +import sys
    +import shutil
    +import subprocess
    +from collections import namedtuple
    +
    +SPARK_PROJ_ROOT = \
    +    os.path.join(os.path.dirname(os.path.realpath(__file__)), "..")
    +USER_HOME_DIR = os.environ.get("HOME")
    +
    +SBT_MAVEN_PROFILE_ARGS_ENV = "SBT_MAVEN_PROFILES_ARGS"
    +AMPLAB_JENKINS_BUILD_TOOL = os.environ.get("AMPLAB_JENKINS_BUILD_TOOL")
    +AMPLAB_JENKINS = os.environ.get("AMPLAB_JENKINS")
    +
    +SBT_OUTPUT_FILTER = re.compile("^.*[info].*Resolving" + "|" + 
    +                               "^.*[warn].*Merging" + "|" +
    +                               "^.*[info].*Including")
    +
    +
    +def get_error_codes(err_code_file):
    +    """Function to retrieve all block numbers from the `run-tests-codes.sh`
    +    file to maintain backwards compatibility with the `run-tests-jenkins` 
    +    script"""
    +    
    +    with open(err_code_file, 'r') as f:
    +        err_codes = [e.split()[1].strip().split('=') 
    +                     for e in f if e.startswith("readonly")]
    +        return dict(err_codes)
    +
    +
    +def exit_from_command_with_retcode(cmd, retcode):
    +    print "[error] running", cmd, "; received return code", retcode
    --- End diff --
    
    From @nchammas above:
    
    > Python 2.6 is the oldest version of Python that Spark officially supports.
    > 
    > We also added Python 3 support recently, so ideally this script should be 
able to run on 2.6+ and 3.3+, but I think it's fine to start with just 2.6+ 
since this is a developer script.
    
    Given that maybe we should explicitly call out `python2` at the top?


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