Resources for the second edition are here. I'd love to know what you think about Python Crash Course; please consider taking a brief survey. If you'd like to know when additional resources are available, you can sign up for email notifications here.
Pip is a special program used to install Python packages to your system. Pip is sometimes included automatically when Python is installed to your system, and sometimes you have to install it yourself. These instructions will help you check if pip is on your system, and help you upgrade or install it if necessary.
- Pip on Linux
- Checking for pip on Linux
- Installing pip on Linux
- Upgrading pip on Linux
- Installing Python packages with pip on Linux
- Uninstalling packages with pip on Linux
- Pip on OS X
- Checking for pip on OS X
- Installing pip on OS X
- Upgrading pip on OS X
- Installing Python packages with pip on OS X
- Uninstalling packages with pip on OS X
- Pip on Windows
- Checking for pip on Windows
- Installing pip on Windows
- Upgrading pip on Windows
- Installing Python packages with pip on Windows
- Uninstalling packages with pip on Windows
Pip on Linux
Checking for pip on Linux
First, check whether pip is installed on your system:
$ pip --versionpip 7.0.3 from /usr/local/lib/python3.5/dist-packages (python 3.5)The output of pip --version tells you which version of pip is currently installed, and which version of Python it’s set up to install packages for. This is especially helpful if you have more than one version of Python installed on your system.
If you have only one version of Python installed on your system, you can use pip to install packages. You might want to try upgrading pip first though.
If you have more than one version of Python installed on your system, you should also try the command pip3:
$ pip3 --versionpip 7.0.3 from /usr/local/lib/python3.5/dist-packages (python 3.5)Here pip3 is set up to install to the same version of Python, but often times pip will install to Python 2. pip3, if you have it set up, should always install packages to the version of Python 3 you have installed.
top
Installing pip on Linux
To install pip, go to https://bootstrap.pypa.io/get-pip.py. Save the file if you’re prompted to do so; if the code for get-pip.py appears in your browser, copy and paste the entire program into your text editor and save the file as get-pip.py.
Open a terminal and navigate to the folder containing get-pip.py, and run it with administrative privileges:
$ cd DownloadsDownloads$ sudo python get-pip.pyCollecting pip Downloading pip-7.1.2-py2.py3-none-any.whl (1.1MB) 100% |████████████████████████████████| 1.1MB 448kB/s Collecting setuptools Downloading setuptools-18.4-py2.py3-none-any.whl (462kB) 100% |████████████████████████████████| 462kB 676kB/s Collecting wheel Downloading wheel-0.26.0-py2.py3-none-any.whl (63kB) 100% |████████████████████████████████| 65kB 912kB/s Installing collected packages: pip, setuptools, wheelSuccessfully installed pip-7.1.2 setuptools-18.4 wheel-0.26.0After the program runs, use the command pip --version (or pip3 --version) to make sure pip was installed correctly.
top
Upgrading pip on Linux
Once you have pip installed, it’s good to upgrade it from time to time. Usually pip will prompt you with instructions for how to upgrade it when necessary, but you can try to upgrade manually any time. For example, here’s sample output for upgrading an out-of-date version of pip:
$ sudo pip install --upgrade pipYou are using pip version 6.1.1, however version 7.1.2 is available.You should consider upgrading via the 'pip install --upgrade pip' command.Collecting pip Downloading pip-7.1.2-py2.py3-none-any.whl (1.1MB) 100% |████████████████████████████████| 1.1MB 382kB/s Installing collected packages: pip Found existing installation: pip 6.1.1 Uninstalling pip-6.1.1: Successfully uninstalled pip-6.1.1Successfully installed pip-7.1.2top
Installing Python packages with pip on Linux
Once you have pip installed, most Python packages can be installed in one line. For example, here’s how you can install Requests, which is used to make API calls from Python programs:
$ pip install --user requestsCollecting requests Downloading requests-2.8.1-py2.py3-none-any.whl (497kB) 100% |████████████████████████████████| 499kB 595kB/s Installing collected packages: requestsSuccessfully installed requestsHere pip has downloaded the files needed to install Requests, and then managed the installation for us. The --user flag means pip has made Requests available to us, but not to other users. This keeps each user’s Python packages from conflicting with each other on systems with more than one user. It’s a good idea to use this flag unless you have a specific reason not to.
Now you can start a Python terminal session, and import requests:
$ python>>> import requests>>> url = "http://google.com">>> r = requests.get(url)>>> r.status_code200Here we’ve used requests to retrieve Google’s home page, and the status code of 200 tells us that the request was successful.
top
Uninstalling packages with pip on Linux
If you ever want to uninstall a package, you can use requests to do so as well:
$ pip uninstall requestsUninstalling requests-2.8.1: /home/ehmatthes/.local/lib/python3.5/site-packages/requests-2.8.1.dist-info/DESCRIPTION.rst ...Proceed (y/n)? y Successfully uninstalled requests-2.8.1Pip lists all the files that will be removed, prompts you about whether to proceed, and then uninstalls the package.
top
Pip on OS X
Checking for pip on OS X
First, check whether pip is installed on your system:
$ pip --versionpip 7.0.3 from /usr/local/lib/python3.5/dist-packages (python 3.5)The output of pip --version tells you which version of pip is currently installed, and which version of Python it’s set up to install packages for. This is especially helpful if you have more than one version of Python installed on your system.
If you have only one version of Python installed on your system, you can use pip to install packages. You might want to try upgrading pip first though.
If you have more than one version of Python installed on your system, you should also try the command pip3:
$ pip3 --versionpip 7.0.3 from /usr/local/lib/python3.5/dist-packages (python 3.5)Here pip3 is set up to install to the same version of Python, but often times pip will install to Python 2. pip3, if you have it set up, should always install packages to the version of Python 3 you have installed.
top
Installing pip on OS X
To install pip, go to https://bootstrap.pypa.io/get-pip.py. Save the file if you’re prompted to do so; if the code for get-pip.py appears in your browser, copy and paste the entire program into your text editor and save the file as get-pip.py.
Open a terminal and navigate to the folder containing get-pip.py, and run it with administrative privileges:
$ cd DownloadsDownloads$ sudo python get-pip.pyCollecting pip Downloading pip-7.1.2-py2.py3-none-any.whl (1.1MB) 100% |████████████████████████████████| 1.1MB 448kB/s Collecting setuptools Downloading setuptools-18.4-py2.py3-none-any.whl (462kB) 100% |████████████████████████████████| 462kB 676kB/s Collecting wheel Downloading wheel-0.26.0-py2.py3-none-any.whl (63kB) 100% |████████████████████████████████| 65kB 912kB/s Installing collected packages: pip, setuptools, wheelSuccessfully installed pip-7.1.2 setuptools-18.4 wheel-0.26.0After the program runs, use the command pip --version (or pip3 --version) to make sure pip was installed correctly.
top
Upgrading pip on OS X
Once you have pip installed, it’s good to upgrade it from time to time. Usually pip will prompt you with instructions for how to upgrade it when necessary, but you can try to upgrade manually any time. For example, here’s sample output for upgrading an out-of-date version of pip:
$ sudo pip install --upgrade pipYou are using pip version 6.1.1, however version 7.1.2 is available.You should consider upgrading via the 'pip install --upgrade pip' command.Collecting pip Downloading pip-7.1.2-py2.py3-none-any.whl (1.1MB) 100% |████████████████████████████████| 1.1MB 382kB/s Installing collected packages: pip Found existing installation: pip 6.1.1 Uninstalling pip-6.1.1: Successfully uninstalled pip-6.1.1Successfully installed pip-7.1.2top
Installing Python packages with pip on OS X
Once you have pip installed, most Python packages can be installed in one line. For example, here’s how you can install Requests, which is used to make API calls from Python programs:
$ pip install --user requestsCollecting requests Downloading requests-2.8.1-py2.py3-none-any.whl (497kB) 100% |████████████████████████████████| 499kB 595kB/s Installing collected packages: requestsSuccessfully installed requestsHere pip has downloaded the files needed to install Requests, and then managed the installation for us. The --user flag means pip has made Requests available to us, but not to other users. This keeps each user’s Python packages from conflicting with each other on systems with more than one user. It’s a good idea to use this flag unless you have a specific reason not to.
Now you can start a Python terminal session, and import requests:
$ python>>> import requests>>> url = "http://google.com">>> r = requests.get(url)>>> r.status_code200Here we’ve used requests to retrieve Google’s home page, and the status code of 200 tells us that the request was successful.
top
Uninstalling packages with pip on OS X
If you ever want to uninstall a package, you can use requests to do so as well:
$ pip uninstall requestsUninstalling requests-2.8.1: /home/ehmatthes/.local/lib/python3.5/site-packages/requests-2.8.1.dist-info/DESCRIPTION.rst ...Proceed (y/n)? y Successfully uninstalled requests-2.8.1Pip lists all the files that will be removed, prompts you about whether to proceed, and then uninstalls the package.
top
Pip on Windows
Checking for pip on Windows
First, check whether pip is installed on your system. Open a terminal window and issue the following command:
> python -m pip --versionpip 7.0.3 from C:\Python35\lib\site-packages (python 3.5)The output of pip --version tells you which version of pip is currently installed, and which version of Python it’s set up to install packages for. This is especially helpful if you have more than one version of Python installed on your system.
If you have only one version of Python installed on your system, you can use pip to install packages. You might want to try upgrading pip first though.
If you have more than one version of Python installed on your system, you should also try the command pip3:
> python -m pip3 --versionpip 7.0.3 from C:\Python35\lib\site-packages (python 3.5)Here pip3 is set up to install to the same version of Python, but often times pip will install to Python 2. pip3, if you have it set up, should always install packages to the version of Python 3 you have installed.
top
Installing pip on Windows
To install pip, go to https://bootstrap.pypa.io/get-pip.py. Save the file if you’re prompted to do so; if the code for get-pip.py appears in your browser, copy and paste the entire program into your text editor and save the file as get-pip.py.
Open a terminal and navigate to the folder containing get-pip.py, and run it with administrative privileges:
> cd DownloadsDownloads> python get-pip.pyCollecting pip Downloading pip-7.1.2-py2.py3-none-any.whl (1.1MB) 100% |████████████████████████████████| 1.1MB 448kB/s Collecting setuptools Downloading setuptools-18.4-py2.py3-none-any.whl (462kB) 100% |████████████████████████████████| 462kB 676kB/s Collecting wheel Downloading wheel-0.26.0-py2.py3-none-any.whl (63kB) 100% |████████████████████████████████| 65kB 912kB/s Installing collected packages: pip, setuptools, wheelSuccessfully installed pip-7.1.2 setuptools-18.4 wheel-0.26.0After the program runs, use the command pip --version (or pip3 --version) to make sure pip was installed correctly.
top
Upgrading pip on Windows
Once you have pip installed, it’s good to upgrade it from time to time. Usually pip will prompt you with instructions for how to upgrade it when necessary, but you can try to upgrade manually any time. For example, here’s sample output for upgrading an out-of-date version of pip:
> python -m pip install --upgrade pipYou are using pip version 6.1.1, however version 7.1.2 is available.You should consider upgrading via the 'pip install --upgrade pip' command.Collecting pip Downloading pip-7.1.2-py2.py3-none-any.whl (1.1MB) 100% |████████████████████████████████| 1.1MB 382kB/s Installing collected packages: pip Found existing installation: pip 6.1.1 Uninstalling pip-6.1.1: Successfully uninstalled pip-6.1.1Successfully installed pip-7.1.2top
Installing Python packages with pip on Windows
Once you have pip installed, most Python packages can be installed in one line. For example, here’s how you can install Requests, which is used to make API calls from Python programs:
> python -m pip install --user requestsCollecting requests Downloading requests-2.8.1-py2.py3-none-any.whl (497kB) 100% |████████████████████████████████| 499kB 595kB/s Installing collected packages: requestsSuccessfully installed requestsHere pip has downloaded the files needed to install Requests, and then managed the installation for us. The --user flag means pip has made Requests available to us, but not to other users. This keeps each user’s Python packages from conflicting with each other on systems with more than one user. It’s a good idea to use this flag unless you have a specific reason not to.
Now you can start a Python terminal session, and import requests:
> python>>> import requests>>> url = "http://google.com">>> r = requests.get(url)>>> r.status_code200Here we’ve used requests to retrieve Google’s home page, and the status code of 200 tells us that the request was successful.
top
Uninstalling packages with pip on Windows
If you ever want to uninstall a package, you can use requests to do so as well:
> python -m pip uninstall requestsUninstalling requests-2.8.1: ...Proceed (y/n)? y Successfully uninstalled requests-2.8.1Pip lists all the files that will be removed, prompts you about whether to proceed, and then uninstalls the package.
top
