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| <div class="section" id="pythonoperator"> |
| <span id="howto-operator-pythonoperator"></span><h1>PythonOperator<a class="headerlink" href="#pythonoperator" title="Permalink to this headline">¶</a></h1> |
| <p>Use the <a class="reference internal" href="../../_api/airflow/operators/python_operator/index.html#airflow.operators.python_operator.PythonOperator" title="airflow.operators.python_operator.PythonOperator"><code class="xref py py-class docutils literal notranslate"><span class="pre">PythonOperator</span></code></a> to execute |
| Python callables.</p> |
| <div class="example-block-wrapper docutils container"> |
| <p class="example-header example-header--with-button"><span class="example-title">airflow/example_dags/example_python_operator.py</span><a class="example-header-button viewcode-button reference internal" href="../../_modules/airflow/example_dags/example_python_operator.html"><span>View Source</span></a></p> |
| <div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="k">def</span> <span class="nf">print_context</span><span class="p">(</span><span class="n">ds</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span> |
| <span class="n">pprint</span><span class="p">(</span><span class="n">kwargs</span><span class="p">)</span> |
| <span class="k">print</span><span class="p">(</span><span class="n">ds</span><span class="p">)</span> |
| <span class="k">return</span> <span class="s1">'Whatever you return gets printed in the logs'</span> |
| |
| |
| <span class="n">run_this</span> <span class="o">=</span> <span class="n">PythonOperator</span><span class="p">(</span> |
| <span class="n">task_id</span><span class="o">=</span><span class="s1">'print_the_context'</span><span class="p">,</span> |
| <span class="n">provide_context</span><span class="o">=</span><span class="bp">True</span><span class="p">,</span> |
| <span class="n">python_callable</span><span class="o">=</span><span class="n">print_context</span><span class="p">,</span> |
| <span class="n">dag</span><span class="o">=</span><span class="n">dag</span><span class="p">,</span> |
| <span class="p">)</span> |
| </pre></div> |
| </div> |
| </div> |
| <div class="section" id="passing-in-arguments"> |
| <h2>Passing in arguments<a class="headerlink" href="#passing-in-arguments" title="Permalink to this headline">¶</a></h2> |
| <p>Use the <code class="docutils literal notranslate"><span class="pre">op_args</span></code> and <code class="docutils literal notranslate"><span class="pre">op_kwargs</span></code> arguments to pass additional arguments |
| to the Python callable.</p> |
| <div class="example-block-wrapper docutils container"> |
| <p class="example-header example-header--with-button"><span class="example-title">airflow/example_dags/example_python_operator.py</span><a class="example-header-button viewcode-button reference internal" href="../../_modules/airflow/example_dags/example_python_operator.html"><span>View Source</span></a></p> |
| <div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="k">def</span> <span class="nf">my_sleeping_function</span><span class="p">(</span><span class="n">random_base</span><span class="p">):</span> |
| <span class="sd">"""This is a function that will run within the DAG execution"""</span> |
| <span class="n">time</span><span class="o">.</span><span class="n">sleep</span><span class="p">(</span><span class="n">random_base</span><span class="p">)</span> |
| |
| |
| <span class="c1"># Generate 5 sleeping tasks, sleeping from 0.0 to 0.4 seconds respectively</span> |
| <span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">5</span><span class="p">):</span> |
| <span class="n">task</span> <span class="o">=</span> <span class="n">PythonOperator</span><span class="p">(</span> |
| <span class="n">task_id</span><span class="o">=</span><span class="s1">'sleep_for_'</span> <span class="o">+</span> <span class="nb">str</span><span class="p">(</span><span class="n">i</span><span class="p">),</span> |
| <span class="n">python_callable</span><span class="o">=</span><span class="n">my_sleeping_function</span><span class="p">,</span> |
| <span class="n">op_kwargs</span><span class="o">=</span><span class="p">{</span><span class="s1">'random_base'</span><span class="p">:</span> <span class="nb">float</span><span class="p">(</span><span class="n">i</span><span class="p">)</span> <span class="o">/</span> <span class="mi">10</span><span class="p">},</span> |
| <span class="n">dag</span><span class="o">=</span><span class="n">dag</span><span class="p">,</span> |
| <span class="p">)</span> |
| |
| <span class="n">run_this</span> <span class="o">>></span> <span class="n">task</span> |
| </pre></div> |
| </div> |
| </div> |
| </div> |
| <div class="section" id="templating"> |
| <h2>Templating<a class="headerlink" href="#templating" title="Permalink to this headline">¶</a></h2> |
| <p>When you set the <code class="docutils literal notranslate"><span class="pre">provide_context</span></code> argument to <code class="docutils literal notranslate"><span class="pre">True</span></code>, Airflow passes in |
| an additional set of keyword arguments: one for each of the <a class="reference internal" href="../../macros.html"><span class="doc">Jinja |
| template variables</span></a> and a <code class="docutils literal notranslate"><span class="pre">templates_dict</span></code> argument.</p> |
| <p>The <code class="docutils literal notranslate"><span class="pre">templates_dict</span></code> argument is templated, so each value in the dictionary |
| is evaluated as a <a class="reference internal" href="../../concepts.html#id1"><span class="std std-ref">Jinja template</span></a>.</p> |
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