1.1. Go to https://www.python.org/downloads/windows/
1.2. In the left column, locate the Windows installer of a suitable version e.g. the Python 3.9.10 - Jan. 14, 2022 release and download the associated .exe file.
Note: For most systems, the
Windows installer (64-bit) (https://www.python.org/ftp/python/3.9.10/python-3.9.10-amd64.exe)will be the correct version. If your computer is older than a decade, chances are that you might need to select 32-bit binary or a slightly older version of Python.
Note: For most users, the default installation options will work. On a shared or office computer, you might need to uncheck the Install launcher for all users, if you lack administrative privileges on the system. To do so, select the Customize installation option.
1.5. Click Install Now and follow the installer steps. You should be able to click next/continue on all steps. Python will be installed.
2.1. From the start menu, launch the default command line application cmd or any other like the PowerShell.
Note: Upon entering
python --versionthe version of the previously installed Python distribution should be shown. If a version number < 3.7 is shown or Python is not found, please consult the :ref:Troubleshooting<troubleshooting>section below.
2.3. Python ships with a helper program called pip to install additional packages. In the next step, this software should be upgraded to its current version.
To upgrade pip, enter the command python -m pip install --upgrade pip to the terminal.
2.4. After pip was successfully upgraded, the Data Delivery System Command Line Interface can be installed:
Enter python -m pip install dds_cli to start the install. Because several requirements will be automatically installed with the command line interface, several packages will be automatically downloaded:
2.5. After the installation procedure has completed, the Data Delivery System Command Line Interface can be launched from the command line by entering dds. Please consult the general manual, how to interact with the CLI.
The most likely reason for this is an issue with the PATH variable, e.g. when the box Add Python 3.9 to Path was not checked during installation.
This can be manually checked and corrected via the Environment Variables.
Open the Environment Variables dialogue via the Advanced Tab in the System Properties.
Select Path from the list of variables and click edit. Mind that there is a set of variables specific to the user on the top and a system-wide set of variables at the bottom. Both contain a Path and depending on the mode of installation, Python might be added to both or just one of them.
Verify that the directories associated with the installation are present in the Path. If not, add the respective directories manually.
Use the search function first to verify where the Python installation has been added. Typically, all installation paths will contain your username and thus need to be customized. Change the paths shown in the example to: C:\User\username\AppData ….
It may be possible, that you will need to approve changes to your system explicitly during the install:
In the latter case - depending on the installation directory - the combined length of all directories in PATH may exceed the length limit. Extending the allowed length should not negatively impact your system.