Managing Python Dependencies Transcripts
Chapter: Managing Third-Party Dependencies With pip
Lecture: Installing & Updating pip
Login or
purchase this course
to watch this video and the rest of the course contents.
0:01
Before we continue, I want to make sure you actually have
0:04
a working pip install at this point, and that it's fully up to date.
0:07
So let's talk about installing pip if it's not already on your system
0:11
and then also how you can upgrade to the latest version of pip.
0:14
So all modern versions of Python 2 and Python 3
0:18
are going to include pip by default.
0:21
Now of course that doesn't really help you if the pip command doesn't work
0:24
in your system right now, so let's talk about what you can do
0:27
if pip is not available on your system yet.
0:31
The first option to get a working pip install on your system
0:34
would be to upgrade to a more modern version of Python
0:37
which is automatically going to include the latest version of pip.
0:40
Now, this would be my preferred option, but of course,
0:44
if you're working with older legacy versions of Python
0:47
and you have a bunch of code running on them already,
0:50
then that isn't really the best option.
0:53
So, option 2 would be to add pip to your existing Python install,
0:57
and that is definitely possible, I am going to show you how to do that now.
1:01
So in a nutshell, on Mac OS and Windows,
1:04
you would have to download a so called bootstrap script, called get-pip.py.
1:09
And you would download that through a browser
1:12
or through a command line tool like curl,
1:15
and once you've downloaded the get pip script,
1:18
you would run it with the Python interpreter.
1:21
So you would just go to the terminal and run something like python get-pip.py
1:25
and the get pip script would then automatically install
1:28
and set up pip on your system.
1:31
Now, on most versions of Linux,
1:34
especially if you're using a version based on Debian Linux like Ubuntu,
1:37
you would actually go through the system package manager to install pip.
1:41
To do that, you would first run a command like sudo apt update
1:45
to refresh your system's package manger and then you would follow up
1:49
with sudo apt install python-pip, and running that command
1:54
would add pip to your existing Python install.
1:57
Now adding pip to an existing Python install is a little bit fiddly,
2:01
there are a couple of edge cases you need to look out for,
2:05
one resource that I can recommend to learn more
2:07
about how to do this, is the Python packaging guide.
2:11
You can find it at packaging.python.org.
2:15
Let's make sure you're running an up to date version of pip on your system.
2:18
Modern versions of Python will always include the latest pip version
2:22
that came out when the Python release was prepared.
2:25
But, pip and Python are actually fully independent,
2:29
so you can update pip without updating Python for example.
2:33
Depending on the operating system that you're on,
2:36
the steps you need to take to update pip are slightly different.
2:40
On Mac OS and Windows you would typically just use the pip command
2:44
to tell pip to upgrade itself, and I am going to give you
2:47
a live demo of how to do that shortly.
2:50
On a Linux system where you are using the system package manager
2:54
to manage your Python install, you would typically upgrade pip through that,
2:58
so you wouldn't actually use the pip command to upgrade pip
3:01
but you would just tell the system package manager to update your install of pip.
3:06
I am going to give you a live demo of how that upgrade process works.
3:10
So I am back here in my Mac OS terminal
3:14
and I've prepared this command here,
3:17
so I am running this command, sudo pip install --upgrade pip setuptools
3:23
And what this is going to do, it's basically telling pip to upgrade itself.
3:28
Set up tools here is just another dependency for pip
3:31
and part of the package management system in Python.
3:35
So typically, you would update both of them at the same time.
3:38
I am going to go ahead and run this command now,
3:41
so because I am running this with sudo, I need to enter my account password,
3:44
okay, so this worked, and what pip is telling us here is that
3:48
essentially everything is up to date.
3:51
So any time you want to update pip to the latest version in the future,
3:54
you would just rerun that command, and then if there is an update
3:57
pip would install it and upgrade itself to the latest version.
