Installation

Leon Jacobs edited this page Sep 14, 2017 · 20 revisions

The installation of the objection python component should be relatively simple. In fact, a simple pip3 install objection will suffice.

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prerequisites

Before continuing with the installation though, make sure you have the following prerequisites met:

  • python version 3.4+. Check your version with: python -V, upgrade/install using your distributions package manager.
  • pip3 version 9.0+. Check your version with: pip --version, upgrade with: pip install pip --upgrade.
  • (optionally) virtualenv version 15+. Check your version with: virtualenv --version, upgrade/install with: pip install virtualenv --upgrade.

'native' installation

By 'native', we are referring to a non-virtualenv installation, where all of the objection dependencies will be installed in your operating systems python module path. There is nothing wrong with this really, but some may prefer to have isolated environments for certain programs. If this is you, check out the next section.

  1. Make sure your system meets the prerequisites detailed in the previous section.

  2. Next, start the installation using pip3 with:

pip3 install -U objection
  1. Once the dependencies are installed, the objection command should be available in your PATH. In some shells, it may be necessary to run hash -r before the command will be available.

'virtual' installation

By 'virtual', we are referring to the fact that objection will be installed in an isolated python virtual environment. For many, this is the preferred option as objection dependencies will have no effect on any locally installed dependencies within the operating systems module path.

  1. Make sure your system meets the prerequisites detailed in the previous section, including the virtualenv command.

  2. Create a new virtual environment with:

virtualenv --python=python3 ~/virtual-python3
  1. Activate your new python virtual environment with:
source ~/virtual-python3/bin/activate
  1. Next, start the installation using pip3 with:
pip3 install -U objection
  1. Once the dependencies are installed, the objection command should be available in your PATH. In some shells, it may be necessary to run hash -r before the command will be available.

errors

The most common error you are likely to face is one that might look as follows:

~ # pip3 install objection
Collecting objection
  Could not find a version that satisfies the requirement objection (from versions: )
No matching distribution found for objection

This means that you are trying to install objection using Python 2 and not Python 3. Either change your interpreter to Python 3, try and install using pip3 and not pip or activate a new virtual environment.

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