sunjincheng121 commented on a change in pull request #8907: [FLINK-12722][docs] Adds Python Table API tutorial URL: https://github.com/apache/flink/pull/8907#discussion_r298045942
########## File path: docs/tutorials/python_table_api.md ########## @@ -0,0 +1,158 @@ +--- +title: "Python API Tutorial" +nav-title: Python API +nav-parent_id: apitutorials +nav-pos: 10 +--- +<!-- +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} + +In this guide we will start from scratch and go from setting up a Flink Python project +to running a Python Table API program. + +## Setting up a Python Project + +Firstly, you can fire up your favorite IDE and create a Python project and then +you need to install the PyFlink package. Please +see [Build PyFlink]({{ site.baseurl }}/flinkDev/building.html#build-pyflink) +for more details about this. + +## Writing a Flink Python Table API Program + +The first step in a Flink Python Table API program is to create a `BatchTableEnvironment` +(or `StreamTableEnvironment` if you are writing a streaming job). It is the main entrypoint +for Python Table API jobs. + +{% highlight python %} +exec_env = ExecutionEnvironment.get_execution_environment() +exec_env.set_parallelism(1) +t_config = TableConfig() +t_env = BatchTableEnvironment.create(exec_env, t_config) +{% endhighlight %} + +The `ExecutionEnvironment` (or `StreamExecutionEnvironment` if you are writing a streaming job) +can be used to set execution parameters, such as the restart strategy, default parallelism, etc. + +The `TableConfig` can be used by set the parameters such as the built-in catalog name, the +threshold where generating code, etc. + +Next we will create a source table and a sink table. + +{% highlight python %} +t_env.connect(FileSystem().path('/tmp/input')) \ + .with_format(OldCsv() + .line_delimiter(' ') + .field('word', DataTypes.STRING()))\ Review comment: Add a space for `\` ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] With regards, Apache Git Services
