How To Install python-contract on Ubuntu 18.04
Introduction
In this tutorial we learn how to install python-contract on Ubuntu 18.04.
What is python-contract
python-contract is:
This package provides a means for programming by contract in Python. Programming by contact is a methodology whereby a API designer can define checkable preconditions and postconditions for method calls, and invariants for classes and methods. The most famous use of this methodology is in the Eiffel programming language.
This implementation of programming by contract has the developer write constraints in the docstrings of methods and classes that can be optionally checked at runtime. If the constraints are not met, an exception is raised.
There are three methods to install python-contract on Ubuntu 18.04. We can use apt-get, apt and aptitude. In the following sections we will describe each method. You can choose one of them.
Install python-contract Using apt-get
Update apt database with apt-get using the following command.
sudo apt-get update
After updating apt database, We can install python-contract using apt-get by running the following command:
sudo apt-get -y install python-contract
Install python-contract Using apt
Update apt database with apt using the following command.
sudo apt update
After updating apt database, We can install python-contract using apt by running the following command:
sudo apt -y install python-contract
Install python-contract Using aptitude
If you want to follow this method, you might need to install aptitude first since aptitude is usually not installed by default on Ubuntu. Update apt database with aptitude using the following command.
sudo aptitude update
After updating apt database, We can install python-contract using aptitude by running the following command:
sudo aptitude -y install python-contract
How To Uninstall python-contract on Ubuntu 18.04
To uninstall only the python-contract package we can use the following command:
sudo apt-get remove python-contract
Uninstall python-contract And Its Dependencies
To uninstall python-contract and its dependencies that are no longer needed by Ubuntu 18.04, we can use the command below:
sudo apt-get -y autoremove python-contract
Remove python-contract Configurations and Data
To remove python-contract configuration and data from Ubuntu 18.04 we can use the following command:
sudo apt-get -y purge python-contract
Remove python-contract configuration, data, and all of its dependencies
We can use the following command to remove python-contract configurations, data and all of its dependencies, we can use the following command:
sudo apt-get -y autoremove --purge python-contract
References
Summary
In this tutorial we learn how to install python-contract package on Ubuntu 18.04 using different package management tools: apt, apt-get and aptitude.
