This guide discusses how to install packages using pip anda virtual environment manager: either venv for Python 3 or virtualenvfor Python 2. These are the lowest-level tools for managing Pythonpackages and are recommended if higher-level tools do not suit your needs.

Install Python Library Mac Os
Install Python Library Mac

Note

This doc uses the term package to refer to aDistribution Package which is different from an ImportPackage that which is used to import modules in your Python source code.

Installing pip¶

pip is the reference Python package manager. It’s used to install andupdate packages. You’ll need to make sure you have the latest version of pipinstalled.

So, in summary, the reason that installation of packages in the Jupyter notebook is fraught with difficulty is fundamentally that Jupyter's shell environment and Python kernel are mismatched, and that means that you have to do more than simply pip install or conda install to make things work.

Apr 26, 2016 Active Oldest Votes 1 To install a python library that does not have a setup.py file, the location of the library's root directory needs to be appended to the $PYTHONPATH environment variable for Python to be able to locate it. This is what the third command export PYTHONPATH=$ (pwd):$PYTHONPATH does on a temporary basis. If you get build errors like this, it typically means that it can't find the underlying TA-Lib library and needs to be installed: Dependencies. To use TA-Lib for python, you need to have the TA-Lib already installed: Mac OS X $ brew install ta-lib Windows. Download ta-lib-0.4.0-msvc.zip and unzip to C: ta-lib. Download ta-lib-0.4.0-src. Python Releases for Mac OS X. Latest Python 3 Release - Python 3.9.5; Latest Python 2 Release - Python 2.7.18; Stable Releases. Python 3.9.5 - May 3, 2021.

Windows¶

The Python installers for Windows include pip. You should be able to accesspip using:

You can make sure that pip is up-to-date by running:

Linux and macOS¶

Debian and most other distributions include a python-pip package, if youwant to use the Linux distribution-provided versions of pip seeInstalling pip/setuptools/wheel with Linux Package Managers.

You can also install pip yourself to ensure you have the latest version. It’srecommended to use the system pip to bootstrap a user installation of pip:

Afterwards, you should have the newest pip installed in your user site:

Installing virtualenv¶

Note

If you are using Python 3.3 or newer, the venv module isthe preferred way to create and manage virtual environments.venv is included in the Python standard library and requires no additional installation.If you are using venv, you may skip this section.

virtualenv is used to manage Python packages for different projects.Using virtualenv allows you to avoid installing Python packages globallywhich could break system tools or other projects. You can install virtualenvusing pip.

On macOS and Linux:

On Windows:

Creating a virtual environment¶

venv (for Python 3) and virtualenv (for Python 2) allowyou to manage separate package installations fordifferent projects. They essentially allow you to create a “virtual” isolatedPython installation and install packages into that virtual installation. Whenyou switch projects, you can simply create a new virtual environment and nothave to worry about breaking the packages installed in the other environments.It is always recommended to use a virtual environment while developing Pythonapplications.

To create a virtual environment, go to your project’s directory and runvenv. If you are using Python 2, replace venv with virtualenvin the below commands.

On macOS and Linux:

On Windows:

The second argument is the location to create the virtual environment. Generally, youcan just create this in your project and call it env.

venv will create a virtual Python installation in the env folder.

Note

You should exclude your virtual environment directory from your versioncontrol system using .gitignore or similar.

Activating a virtual environment¶

Before you can start installing or using packages in your virtual environment you’llneed to activate it. Activating a virtual environment will put thevirtual environment-specificpython and pip executables into your shell’s PATH.

On macOS and Linux:

On Windows:

You can confirm you’re in the virtual environment by checking the location of yourPython interpreter, it should point to the env directory.

On macOS and Linux:

On Windows:

As long as your virtual environment is activated pip will install packages into thatspecific environment and you’ll be able to import and use packages in yourPython application.

Leaving the virtual environment¶

If you want to switch projects or otherwise leave your virtual environment, simply run:

If you want to re-enter the virtual environment just follow the same instructions aboveabout activating a virtual environment. There’s no need to re-create the virtual environment.

Installing packages¶

Now that you’re in your virtual environment you can install packages. Let’s install theRequests library from the Python Package Index (PyPI):

Unix/macOSWindows

pip should download requests and all of its dependencies and install them:

Installing specific versions¶

pip allows you to specify which version of a package to install usingversion specifiers. For example, to installa specific version of requests:

Unix/macOSWindows

To install the latest 2.x release of requests:

Unix/macOSWindows

To install pre-release versions of packages, use the --pre flag:

Unix/macOSWindows

Installing extras¶

Some packages have optional extras. You can tell pip to install these byspecifying the extra in brackets:

Unix/macOSWindows

Installing from source¶

pip can install a package directly from source, for example:

Unix/macOSWindows

Additionally, pip can install packages from source in development mode,meaning that changes to the source directory will immediately affect theinstalled package without needing to re-install:

Unix/macOSWindows

Installing from version control systems¶

pip can install packages directly from their version control system. Forexample, you can install directly from a git repository:

Install Python Library Mac Os

For more information on supported version control systems and syntax, see pip’sdocumentation on VCS Support.

Installing from local archives¶

If you have a local copy of a Distribution Package’s archive (a zip,wheel, or tar file) you can install it directly with pip:

Unix/macOSWindows

If you have a directory containing archives of multiple packages, you can tellpip to look for packages there and not to use thePython Package Index (PyPI) at all:

Install Python Library Mac

Unix/macOSWindows

This is useful if you are installing packages on a system with limitedconnectivity or if you want to strictly control the origin of distributionpackages.

Using other package indexes¶

If you want to download packages from a different

Install Python34 Library Mac