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<blockquote>
<div></div></blockquote>
<div class="section" id="modules-management">
<h1>Modules Management<a class="headerlink" href="#modules-management" title="Permalink to this headline"></a></h1>
<p>Airflow allows you to use your own Python modules in the DAG and in the
Airflow configuration. The following article will describe how you can
create your own module so that Airflow can load it correctly, as well as
diagnose problems when modules are not loaded properly.</p>
<div class="section" id="packages-loading-in-python">
<h2>Packages Loading in Python<a class="headerlink" href="#packages-loading-in-python" title="Permalink to this headline"></a></h2>
<p>The list of directories from which Python tries to load the module is given
by the variable <code class="docutils literal notranslate"><span class="pre">sys.path</span></code>. Python really tries to
<a class="reference external" href="https://stackoverflow.com/a/38403654">intelligently determine the contents of</a>
of this variable, including depending on the operating system and how Python
is installed and which Python version is used.</p>
<p>You can check the contents of this variable for the current Python environment
by running an interactive terminal as in the example below:</p>
<div class="highlight-pycon notranslate"><div class="highlight"><pre><span></span><span class="gp">&gt;&gt;&gt; </span><span class="kn">import</span> <span class="nn">sys</span>
<span class="gp">&gt;&gt;&gt; </span><span class="kn">from</span> <span class="nn">pprint</span> <span class="kn">import</span> <span class="n">pprint</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">pprint</span><span class="p">(</span><span class="n">sys</span><span class="o">.</span><span class="n">path</span><span class="p">)</span>
<span class="go">[&#39;&#39;,</span>
<span class="go"> &#39;/home/arch/.pyenv/versions/3.7.4/lib/python37.zip&#39;,</span>
<span class="go"> &#39;/home/arch/.pyenv/versions/3.7.4/lib/python3.7&#39;,</span>
<span class="go"> &#39;/home/arch/.pyenv/versions/3.7.4/lib/python3.7/lib-dynload&#39;,</span>
<span class="go"> &#39;/home/arch/venvs/airflow/lib/python3.7/site-packages&#39;]</span>
</pre></div>
</div>
<p><code class="docutils literal notranslate"><span class="pre">sys.path</span></code> is initialized during program startup. The first precedence is
given to the current directory, i.e, <code class="docutils literal notranslate"><span class="pre">path[0]</span></code> is the directory containing
the current script that was used to invoke or an empty string in case it was
an interactive shell. Second precedence is given to the <code class="docutils literal notranslate"><span class="pre">PYTHONPATH</span></code> if provided,
followed by installation-dependent default paths which is managed by
<a class="reference external" href="https://docs.python.org/3/library/site.html#module-site">site</a> module.</p>
<p><code class="docutils literal notranslate"><span class="pre">sys.path</span></code> can also be modified during a Python session by simply using append
(for example, <code class="docutils literal notranslate"><span class="pre">sys.path.append(&quot;/path/to/custom/package&quot;)</span></code>). Python will start
searching for packages in the newer paths once they’re added. Airflow makes use
of this feature as described in the section <a class="reference internal" href="#additional-modules-in-airflow"><span class="std std-ref">Additional modules in Airflow</span></a>.</p>
<p>In the variable <code class="docutils literal notranslate"><span class="pre">sys.path</span></code> there is a directory <code class="docutils literal notranslate"><span class="pre">site-packages</span></code> which
contains the installed <strong>external packages</strong>, which means you can install
packages with <code class="docutils literal notranslate"><span class="pre">pip</span></code> or <code class="docutils literal notranslate"><span class="pre">anaconda</span></code> and you can use them in Airflow.
In the next section, you will learn how to create your own simple
installable package and how to specify additional directories to be added
to <code class="docutils literal notranslate"><span class="pre">sys.path</span></code> using the environment variable <span class="target" id="index-0"></span><a class="reference external" href="https://docs.python.org/3/using/cmdline.html#envvar-PYTHONPATH" title="(in Python v3.9)"><code class="xref std std-envvar docutils literal notranslate"><span class="pre">PYTHONPATH</span></code></a>.</p>
</div>
<div class="section" id="creating-a-package-in-python">
<h2>Creating a package in Python<a class="headerlink" href="#creating-a-package-in-python" title="Permalink to this headline"></a></h2>
<ol class="arabic simple">
<li><p>Before starting, install the following packages:</p></li>
</ol>
<p><code class="docutils literal notranslate"><span class="pre">setuptools</span></code>: setuptools is a package development process library designed
for creating and distributing Python packages.</p>
<p><code class="docutils literal notranslate"><span class="pre">wheel</span></code>: The wheel package provides a bdist_wheel command for setuptools. It
creates .whl file which is directly installable through the <code class="docutils literal notranslate"><span class="pre">pip</span> <span class="pre">install</span></code>
command. We can then upload the same file to <a class="reference external" href="pypi.org">PyPI</a>.</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>pip install --upgrade pip setuptools wheel
</pre></div>
</div>
<ol class="arabic simple" start="2">
<li><p>Create the package directory - in our case, we will call it <code class="docutils literal notranslate"><span class="pre">airflow_operators</span></code>.</p></li>
</ol>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>mkdir airflow_operators
</pre></div>
</div>
<ol class="arabic simple" start="3">
<li><p>Create the file <code class="docutils literal notranslate"><span class="pre">__init__.py</span></code> inside the package and add following code:</p></li>
</ol>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="nb">print</span><span class="p">(</span><span class="s2">&quot;Hello from airflow_operators&quot;</span><span class="p">)</span>
</pre></div>
</div>
<p>When we import this package, it should print the above message.</p>
<ol class="arabic simple" start="4">
<li><p>Create <code class="docutils literal notranslate"><span class="pre">setup.py</span></code>:</p></li>
</ol>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">setuptools</span>
<span class="n">setuptools</span><span class="o">.</span><span class="n">setup</span><span class="p">(</span>
<span class="n">name</span><span class="o">=</span><span class="s1">&#39;airflow_operators&#39;</span><span class="p">,</span>
<span class="p">)</span>
</pre></div>
</div>
<ol class="arabic simple" start="5">
<li><p>Build the wheel:</p></li>
</ol>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>python setup.py bdist_wheel
</pre></div>
</div>
<p>This will create a few directories in the project and the overall structure will
look like following:</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>.
├── airflow_operators
│   ├── __init__.py
├── airflow_operators.egg-info
│   ├── PKG-INFO
│   ├── SOURCES.txt
│   ├── dependency_links.txt
│   └── top_level.txt
├── build
│   └── bdist.macosx-10.15-x86_64
├── dist
│   └── airflow_operators-0.0.0-py3-none-any.whl
└── setup.py
</pre></div>
</div>
<ol class="arabic simple" start="6">
<li><p>Install the .whl file using pip:</p></li>
</ol>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>pip install dist/airflow_operators-0.0.0-py3-none-any.whl
</pre></div>
</div>
<ol class="arabic simple" start="7">
<li><p>The package is now ready to use!</p></li>
</ol>
<div class="highlight-pycon notranslate"><div class="highlight"><pre><span></span><span class="gp">&gt;&gt;&gt; </span><span class="kn">import</span> <span class="nn">airflow_operators</span>
<span class="go">Hello from airflow_operators</span>
<span class="go">&gt;&gt;&gt;</span>
</pre></div>
</div>
<p>The package can be removed using pip command:</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>pip uninstall airflow_operators
</pre></div>
</div>
<p>For more details on how to create to create and publish python packages,
see <a class="reference external" href="https://packaging.python.org/tutorials/packaging-projects/">Packaging Python Projects</a>.</p>
</div>
<div class="section" id="adding-directories-to-the-path">
<h2>Adding directories to the path<a class="headerlink" href="#adding-directories-to-the-path" title="Permalink to this headline"></a></h2>
<p>You can specify additional directories to be added to <code class="docutils literal notranslate"><span class="pre">sys.path</span></code> using the
environment variable <span class="target" id="index-1"></span><a class="reference external" href="https://docs.python.org/3/using/cmdline.html#envvar-PYTHONPATH" title="(in Python v3.9)"><code class="xref std std-envvar docutils literal notranslate"><span class="pre">PYTHONPATH</span></code></a>. Start the python shell by providing
the path to root of your project using the following command:</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span><span class="nv">PYTHONPATH</span><span class="o">=</span>/home/arch/projects/airflow_operators python
</pre></div>
</div>
<p>The <code class="docutils literal notranslate"><span class="pre">sys.path</span></code> variable will look like below:</p>
<div class="highlight-pycon notranslate"><div class="highlight"><pre><span></span><span class="gp">&gt;&gt;&gt; </span><span class="kn">import</span> <span class="nn">sys</span>
<span class="gp">&gt;&gt;&gt; </span><span class="kn">from</span> <span class="nn">pprint</span> <span class="kn">import</span> <span class="n">pprint</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">pprint</span><span class="p">(</span><span class="n">sys</span><span class="o">.</span><span class="n">path</span><span class="p">)</span>
<span class="go">[&#39;&#39;,</span>
<span class="go"> &#39;/home/arch/projects/airflow_operators&#39;</span>
<span class="go"> &#39;/home/arch/.pyenv/versions/3.7.4/lib/python37.zip&#39;,</span>
<span class="go"> &#39;/home/arch/.pyenv/versions/3.7.4/lib/python3.7&#39;,</span>
<span class="go"> &#39;/home/arch/.pyenv/versions/3.7.4/lib/python3.7/lib-dynload&#39;,</span>
<span class="go"> &#39;/home/arch/venvs/airflow/lib/python3.7/site-packages&#39;]</span>
</pre></div>
</div>
<p>As we can see that our provided directory is now added to the path, let’s
try to import the package now:</p>
<div class="highlight-pycon notranslate"><div class="highlight"><pre><span></span><span class="gp">&gt;&gt;&gt; </span><span class="kn">import</span> <span class="nn">airflow_operators</span>
<span class="go">Hello from airflow_operators</span>
<span class="go">&gt;&gt;&gt;</span>
</pre></div>
</div>
<p>We can also use <span class="target" id="index-2"></span><a class="reference external" href="https://docs.python.org/3/using/cmdline.html#envvar-PYTHONPATH" title="(in Python v3.9)"><code class="xref std std-envvar docutils literal notranslate"><span class="pre">PYTHONPATH</span></code></a> variable with the airflow commands.
For example, if we run the following airflow command:</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span><span class="nv">PYTHONPATH</span><span class="o">=</span>/home/arch/projects/airflow_operators airflow info
</pre></div>
</div>
<p>We’ll see the <code class="docutils literal notranslate"><span class="pre">Python</span> <span class="pre">PATH</span></code> updated with our mentioned <span class="target" id="index-3"></span><a class="reference external" href="https://docs.python.org/3/using/cmdline.html#envvar-PYTHONPATH" title="(in Python v3.9)"><code class="xref std std-envvar docutils literal notranslate"><span class="pre">PYTHONPATH</span></code></a>
value as shown below:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>Python PATH: [/home/arch/venv/bin:/home/arch/projects/airflow_operators:/usr/lib/python38.zip:/usr/lib/python3.8:/usr/lib/python3.8/lib-dynload:/home/arch/venv/lib/python3.8/site-packages:/home/arch/airflow/dags:/home/arch/airflow/config:/home/arch/airflow/plugins]
</pre></div>
</div>
</div>
<div class="section" id="additional-modules-in-airflow">
<span id="id1"></span><h2>Additional modules in Airflow<a class="headerlink" href="#additional-modules-in-airflow" title="Permalink to this headline"></a></h2>
<p>Airflow adds three additional directories to the <code class="docutils literal notranslate"><span class="pre">sys.path</span></code>:</p>
<ul class="simple">
<li><p>DAGS folder: It is configured with option <code class="docutils literal notranslate"><span class="pre">dags_folder</span></code> in section <code class="docutils literal notranslate"><span class="pre">[core]</span></code>.</p></li>
<li><p>Config folder: It is configured by setting <code class="docutils literal notranslate"><span class="pre">AIRFLOW_HOME</span></code> variable (<code class="docutils literal notranslate"><span class="pre">{AIRFLOW_HOME}/config</span></code>) by default.</p></li>
<li><p>Plugins Folder: It is configured with option <code class="docutils literal notranslate"><span class="pre">plugins_folder</span></code> in section <code class="docutils literal notranslate"><span class="pre">[core]</span></code>.</p></li>
</ul>
<p>You can also see the exact paths using the <code class="docutils literal notranslate"><span class="pre">airflow</span> <span class="pre">info</span></code> command,
and use them similar to directories specified with the environment variable
<span class="target" id="index-4"></span><a class="reference external" href="https://docs.python.org/3/using/cmdline.html#envvar-PYTHONPATH" title="(in Python v3.9)"><code class="xref std std-envvar docutils literal notranslate"><span class="pre">PYTHONPATH</span></code></a>. An example of the contents of the sys.path variable
specified by this command may be as follows:</p>
<p>Python PATH: [/home/rootcss/venvs/airflow/bin:/usr/lib/python38.zip:/usr/lib/python3.8:/usr/lib/python3.8/lib-dynload:/home/rootcss/venvs/airflow/lib/python3.8/site-packages:/home/rootcss/airflow/dags:/home/rootcss/airflow/config:/home/rootcss/airflow/plugins]</p>
<p>Below is the sample output of the <code class="docutils literal notranslate"><span class="pre">airflow</span> <span class="pre">info</span></code> command:</p>
<div class="admonition seealso">
<p class="admonition-title">See also</p>
<p><a class="reference internal" href="plugins.html#plugins-loading"><span class="std std-ref">When are plugins (re)loaded?</span></a></p>
</div>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>Apache Airflow: 2.0.0b3
System info
OS | Linux
architecture | x86_64
uname | uname_result(system=&#39;Linux&#39;, node=&#39;85cd7ab7018e&#39;, release=&#39;4.19.76-linuxkit&#39;, version=&#39;#1 SMP Tue May 26 11:42:35 UTC 2020&#39;, machine=&#39;x86_64&#39;, processor=&#39;&#39;)
locale | (&#39;en_US&#39;, &#39;UTF-8&#39;)
python_version | 3.8.6 (default, Nov 25 2020, 02:47:44) [GCC 8.3.0]
python_location | /usr/local/bin/python
Tools info
git | git version 2.20.1
ssh | OpenSSH_7.9p1 Debian-10+deb10u2, OpenSSL 1.1.1d 10 Sep 2019
kubectl | NOT AVAILABLE
gcloud | NOT AVAILABLE
cloud_sql_proxy | NOT AVAILABLE
mysql | mysql Ver 8.0.22 for Linux on x86_64 (MySQL Community Server - GPL)
sqlite3 | 3.27.2 2019-02-25 16:06:06 bd49a8271d650fa89e446b42e513b595a717b9212c91dd384aab871fc1d0alt1
psql | psql (PostgreSQL) 11.9 (Debian 11.9-0+deb10u1)
Paths info
airflow_home | /root/airflow
system_path | /opt/bats/bin:/usr/local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
python_path | /usr/local/bin:/opt/airflow:/files/plugins:/usr/local/lib/python38.zip:/usr/local/lib/python3.8:/usr/
| local/lib/python3.8/lib-dynload:/usr/local/lib/python3.8/site-packages:/files/dags:/root/airflow/conf
| ig:/root/airflow/plugins
airflow_on_path | True
Config info
executor | LocalExecutor
task_logging_handler | airflow.utils.log.file_task_handler.FileTaskHandler
sql_alchemy_conn | postgresql+psycopg2://postgres:airflow@postgres/airflow
dags_folder | /files/dags
plugins_folder | /root/airflow/plugins
base_log_folder | /root/airflow/logs
Providers info
apache-airflow-providers-amazon | 1.0.0b2
apache-airflow-providers-apache-cassandra | 1.0.0b2
apache-airflow-providers-apache-druid | 1.0.0b2
apache-airflow-providers-apache-hdfs | 1.0.0b2
apache-airflow-providers-apache-hive | 1.0.0b2
</pre></div>
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