Installing Packages using PIP - Part 1

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En provenance du cours de Rice University

Python Data Visualization

63 notes

Rice University

Python Data Visualization

63 notes

Cours 4 sur 4 dans Specialization Introduction to Scripting in Python

This if the final course in the specialization which builds upon the knowledge learned in Python Programming Essentials, Python Data Representations, and Python Data Analysis. We will learn how to install external packages for use within Python, acquire data from sources on the Web, and then we will clean, process, analyze, and visualize that data. This course will combine the skills learned throughout the specialization to enable you to write interesting, practical, and useful programs. By the end of the course, you will be comfortable installing Python packages, analyzing existing data, and generating visualizations of that data. This course will complete your education as a scripter, enabling you to locate, install, and use Python packages written by others. You will be able to effectively utilize tools and packages that are widely available to amplify your effectiveness and write useful programs.

À partir de la leçon

Week 2

This module will teach you about packages and modules in Python, including how to install packages and how to create your own modules. You will also learn to use the Pygal plotting library.

Installing Packages using PIP - Part 17:03

Installing Packages using PIP - Part 26:02

Rencontrer les enseignants

Scott Rixner
Professor
Computer Science
Joe Warren
Professor
Computer Science

[MUSIC]

Welcome to this week's programming tips.

In our previous programming tip, we talked about the basic of the packages and

used Tony's package manager to install simple popular packages for

visualization, in Tony's Python environment.

So there is an important point that I want to make about package installation.

Tony maintains it's own private installation of Python, okay?

Environment like Atom, and IDLE don't use Tony's Python code.

Instead, they use the standard default installation of Python that you get

whenever you go to python.org.

So if you'd like to install packages in something like Atom or IDLE.

I'm going to talk about the command that we're going to use to install those

packages called pip, preferred installer package.

And what we'll do in this video is,

I'll go over kind of the basics of how to do this in the first part of the video.

And then we'll actually do the installation in the second part of

this video.

Okay, let's get to it.

Okay, let's get started on figuring out how to use pip to install packages in

your Python environment.

So, like most cases, we need to read the documentation.

So here, I'm sitting at basically the python.org documentation

on how to install Python modules.

And it has some initial checks to [INAUDIBLE] that describes some of

the important term.

You should read over that and understand what we talked about.

It is the preferred installer program.

We talked about the Python packaging index in the previous programming tip.

That thing that we really going to need to understand is the basic usage.

So if you look at this, the way we're going to install a package using pip is

we're going to need to go to the command line and run the following command,

python -m pip Install the name of the package.

So what's going to happen is Python is going to help you install the package.

Now if you haven't ever run anything from the command line, spend a few minutes,

I'll give you a few hints about how to do this.

But first thing we'll talk about is actually how to get a command prompt

inside your computer, I'll do it for Windows and

have a call out that will say a little about how to do it on Macs.

And then the second thing is, we're going to have to make sure when we run

that command that your computer knows where your Python directory is, and so

we'll talk a little bit about how to find out where your Python installation is.

Okay, let's do that.

Okay, the first we need to do if we want to run PIP is we need to get

a command prompt to actually run the command.

So let's do what we always do we went to Google here.

I said, how do I get a command prompt in Windows and it says what I can do.

I can press the windows key plus R and I will be there.

And it pops up a little thing says to run up something.

And it says run CMD, I'm going to say OK.

And sure enough I get this black window.

And what it is this is a basically command prompt.

It lets me run commands from the command line.

And those commands are textual strings that are going to tell the computer

what to do.

One of the nice things here is this is the default directory,

this is my home directory here.

And if you remember, when we talked about file systems, basically there's always

a director in and and then we can navigate around inside that file system by going to

parent directories and also going down to the child directories.

So there's some commands you should know when you're working with file systems in

Windows, the DIR command has a listing of everything inside the directory here.

I could look here, let's see, here's my Dropbox folder, so

I can change directories to that by saying, cd, and

then actually I'm going to say Dr and hit Tab, and it'll complete that for me.

And notice now I'm down in my Dropbox directory.

And here's my Dropbox directory.

I have a bunch of directories including one for Python Scripting.

So let's just change to that.

I'll say Py Tab, and let's do a directory of that.

And here you can see basically all the files that I've put together for

this particular course.

So you've done that, we've figured out how to turn navigate around on your computer

inside the file system, now let's talk about how we actually run that command.

Okay, we figured out how to fire up a command prompt in Windows, so

let's go back and try to actually install a package from the command line using pip.

So let's go down, we're going to open up command prompt, So

we got it here, that looks good, let's go an enter our command,

python -m pip install, and let's try to install pygul.

I ran it and it did something, it didn't do what we were expecting.

And it says python is not a recognized internal or external command.

The key here is then whenever you say Python, what it's doing is Windows

really your computer is looking for what program is called Python.

And the first place it looks is in the current directory.

So I'm going to say dir here and

if you look there's no file call the python.exe here.

So, when I try to run a command from the command line your computer

has to know where that command resides.

And right now the only thing it knows to look in is the current directory.

So this raises the question of where is python installed,

if I want to go through and try to actually run this command.

I have to make sure your computer knows where Python sits.

So, let's figure out where Python is installed next.

Okay, to figure out where Python is installed on your machine,

we're going to go back to the docs.

We're going to look at this in the case of Windows here,

there's some documentation on Python for Windows.

And so this talks about installing it.

And if you go back and you remember how the installer runs, there's a step where,

basically, a little menu pops up which says, okay,

would you like to install Python?

You have the default location or some custom installation?

And when you click that button right here,

right here is essentially the path for where Python is installed.

So one thing we could do is we could just remember where it's installed

whenever we run it.

But actually,

there's a tip here you can use where you don't have to remember anything.

It's when you install Python there's two buttons that you can click,

there's two check boxes.

I can say install a launcher, I can also add Python to the PATH.

So in Windows, the PATH is basically a list of directories

we're importing commands reside.

So, I said right now when you kind of run a command from the command line,

it always look in the current directory.

If you add it directly to your PATH, Windows will also go look in that list of

directories and see if that command exists in any of those directories in your PATH.

So what we´re going to do is, we´re going to go through them,

install Python, click this button, add it to the PATH, and

then we go up through it and use pip to install some packages.

So let's move on to our second video and actually do an installation.

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