Most Important ''pip'' Commands for a Python Developer
In this article, we will be talking about the six most important pip commands that every Python developer should know. Here is what we will be covering in this article:
What is pip?
pip is a package manager for Python packages. When we install pip, it is added to the system as a command line program which can be run from the command line. We not only use pip to install and uninstall Python packages, it is rather a great tool to create Python virtual environment. And in this article, we will be talking about different useful commands that a Python developer uses in a day to day life.
pip search
Looking for a package, pip is there to help you out. pip search allows you to search PyPI for any package using the pip search <package> command. The result of the command returns the name and description of all the matching packages.
Here is an example:
pip search
pip install
You can install a package using the pip install <package> command. You may already know the package name or you can search for a package using the pip search <package>command. By default a package is installed from PyPI. Given below is a screenshot installing flask:
pip install
pip install has several stages:
- Identify the base requirements. The user-supplied arguments are processed here.
- Resolve dependencies. What will be installed is determined here.
- Build wheels. All the dependencies that can be, are built into wheels.
- Install the packages (and uninstall anything being upgraded/replaced).
There is also a concept called caching. pip provides a cache which functions similarly to that of a web browser and it is on by default. We can disable the cache and always access the PyPI using the –no-cache-dir option as:
quickdev/~ $ pip install --no-cache-dir flask
quickdev/~ $As per PyPA documentation:
When making any HTTP request, pip will first check its local cache to determine if it has a suitable response stored for that request which has not expired. If it does then it simply returns that response and doesn’t make the request.
If it has a response stored, but it has expired, then it will attempt to make a conditional request to refresh the cache which will either return an empty response telling pip to simply use the cached item (and refresh the expiration timer) or it will return a whole new response which pip can then store in the cache.
Using pip, we can also install packages from a requirements file, which we will cover later in the article.
pip show
It’s very common to get details about a package that is currently installed. For any package, this command returns details like name, version, summary, dependent packages and much more. Here is an example:
pip show Jinja2
pip uninstall
This is the simplest one of all. We can remove any package using the pip uninstall <package> command. Here is an example:
pip uninstall
pip list
This is one of the most important command that every Python developer must know. The pip list command returns the list of packages in the current environment. It also returns the installed version for each package. Packages are listed in a case-insensitive sorted order.
pip list
pip list returns a list of all packages. However, for some reason we may also want to list all the packages that are currently outdated. To do so, we can use the pip list -o or pip list --outdated command, which returns a list of packages with the version currently installed and the latest available.
pip list –outdated
On the other hand, to list out all the packages that are up to date, we can use the pip list -u or pip list --uptodate command.
pip freeze
We use this command to freeze the packages and their current version. pip freeze is most useful when we want to use the same set of packages on different platforms or environments. We pass a filename to the pip freeze > filename command. Here is an example:
pip freeze > requirements.txt
Once we have created the file that holds our packages, we can then use that file to set up another environment with those packages. Here is an example, where we have a virtual environment “venv” and we are now installing the required packages from the requirements.txt file, using the pip install -r <path_to_file> command.
pip install -r requirements.txt
Summary
This is fairly a small list, however, these are the most used pip commands for a Python developer in a day to day life. If we want to see other commands or options that are available with pip, just type pip and hit return. This will list all the alternates available.
What commands do you use the most? Don’t forget to share.
