Step 2 : Get Zephyr and install Python dependencies
===================================================

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   .. tab-item:: Get Zephyr and install Python dependencies

        * In this program, you are going to learn


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                * How to ?


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        Topics in this section,

                * :ref:`Install within virtual environment <zephyr_qemu_step2_0>`


.. _zephyr_qemu_step2_0:

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   .. tab-item:: Install within virtual environment

        * Make sure current directory is $HOME

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                $ cd $HOME
        
        * Use ``apt`` to install Python ``venv`` package:

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                $ sudo apt install python3-venv

        * Create a new virtual environment:

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                $ python3 -m venv ~/zephyrproject/.venv

        * Activate the virtual environment:

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                $ source ~/zephyrproject/.venv/bin/activate

        * See the command prompt changed, indicating that it is virtual environment

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                (.venv) test:~$

        * Install west:

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                (.venv) test:~$ pip install west

        * Get the Zephyr source code:

        .. code-block:: c

                (.venv) test:~$ west init ~/zephyrproject
                (.venv) test:~$ cd ~/zephyrproject
                (.venv) test:~$ west update

        * Export a Zephyr CMake package. This allows CMake to automatically load boilerplate code required for building Zephyr applications.

        .. code-block:: c

                (.venv) test:~$ west zephyr-export

        * Zephyr’s scripts/requirements.txt file declares additional Python dependencies. Install them with pip.

        .. code-block:: c

                (.venv) test:~$ pip install -r ~/zephyrproject/zephyr/scripts/requirements.txt