Github user zentol commented on a diff in the pull request:
https://github.com/apache/flink/pull/202#discussion_r23955578
--- Diff: docs/python_programming_guide.md ---
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+---
+title: "Python Programming Guide"
+---
+<!--
+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.
+-->
+
+* This will be replaced by the TOC
+{:toc}
+
+
+<a href="#top"></a>
+
+Introduction
+------------
+
+Analysis programs in Flink are regular programs that implement
transformations on data sets
+(e.g., filtering, mapping, joining, grouping). The data sets are initially
created from certain
+sources (e.g., by reading files, or from collections). Results are
returned via sinks, which may for
+example write the data to (distributed) files, or to standard output (for
example the command line
+terminal). Flink programs run in a variety of contexts, standalone, or
embedded in other programs.
+The execution can happen in a local JVM, or on clusters of many machines.
+
+In order to create your own Flink program, we encourage you to start with
the
+[program skeleton](#program-skeleton) and gradually add your own
+[transformations](#transformations). The remaining sections act as
references for additional
+operations and advanced features.
+
+
+Example Program
+---------------
+
+The following program is a complete, working example of WordCount. You can
copy & paste the code
+to run it locally.
+
+{% highlight python %}
+from flink.plan.Environment import get_environment
+from flink.plan.Constants import INT, STRING
+from flink.functions.GroupReduceFunction import GroupReduceFunction
+
+class Adder(GroupReduceFunction):
+ def reduce(self, iterator, collector):
+ count, word = iterator.next()
+ count += sum([x[0] for x in iterator])
+ collector.collect((count, word))
+
+if __name__ == "__main__":
+ env = get_environment()
+ data = env.from_elements("Who's there?",
+ "I think I hear them. Stand, ho! Who's there?")
+
+ data \
+ .flat_map(lambda x: x.lower().split(), (INT, STRING)) \
+ .group_by(1) \
+ .reduce_group(Adder(), (INT, STRING), combinable=True) \
+ .output()
+
+ env.execute()
+}
--- End diff --
fixed
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