Study from the beginning of Python Hour8: Using packages

Study from the beginning of Python Hour8: Using packages

• When I tried to do something with Python, I first searched for a sample script and somehow executed it.
• 7 hours I want to hit REST API with automatic execution, check the result, and even operate the VM
• If you think about it, it will be 10 times over 7 hours.
• This time we will use the module. By using modules, you can create high quality and quick code. I'm finally here

Learning materials

• Learn the basics in just one day! A super introduction to Python
• https://a.r10.to/hbHMiv

Past posts

• Study from the beginning of Python Hour1: Hello World
• Python study from the beginning Hour2: Control statement
• Study from Python Hour3: Functions
• Python study from the beginning Hour4: Object-oriented ①
• Python study from the beginning Hour5: Object-oriented ②
• Python study from the beginning Hour6: Frequently used data types: tuple type, set type, dictionary type
• Study from Python Hour7: How to use classes
• Study from the beginning of Python Hour8: Using packages
• Python Study from scratch Hour9: File read / write and exception handling
• Python Study from scratch Hour10: Creating an application

environment

• Windows
• Python Ver3 series

Purpose of using the package

• Until now, I've been using the built-in modules and standard libraries of Python itself. print () or ramdom
• Built-in modules and standard libraries can be used by installing Python.
• By using an external package, you can use a convenient package beyond the standard library, which is a general process.

Add an external package

• Install packages using a package management system called pip (like yum)
• Packages are collected on the Python Package Index.

Try installing the package

• This time, I will install the ** requests ** package for operating (acquiring, etc.) web pages. You can install it with * pin install * package name *.

Install the requests package

C:\script>pip --version
pip 19.2.3 from c:\users\matsumo\appdata\local\programs\python\python38\lib\site-packages\pip (python 3.8)

C:\script>pip3 --version
pip 19.2.3 from c:\users\matsumo\appdata\local\programs\python\python38\lib\site-packages\pip (python 3.8)

C:\script>
C:\script>
C:\script>
C:\script>pip install requests #Only this command The following is a message((Although it is already installed)
Requirement already satisfied: requests in c:\users\matsumo\appdata\local\programs\python\python38\lib\site-packages (2.22.0)
Requirement already satisfied: idna<2.9,>=2.5 in c:\users\matsumo\appdata\local\programs\python\python38\lib\site-packages (from requests) (2.8)
Requirement already satisfied: certifi>=2017.4.17 in c:\users\matsumo\appdata\local\programs\python\python38\lib\site-packages (from requests) (2019.11.28)
Requirement already satisfied: urllib3!=1.25.0,!=1.25.1,<1.26,>=1.21.1 in c:\users\matsumo\appdata\local\programs\python\python38\lib\site-packages (from requests) (1.25.7)
Requirement already satisfied: chardet<3.1.0,>=3.0.2 in c:\users\matsumo\appdata\local\programs\python\python38\lib\site-packages (from requests) (3.0.4)
WARNING: You are using pip version 19.2.3, however version 20.0.2 is available.
You should consider upgrading via the 'python -m pip install --upgrade pip' command.

C:\script>

Try upgrading pip.

• I was angry that pip was old in the above result, so I will upgrade
• Message way Try running python -m pip install --upgrade pip

C:\script>python -m pip install --upgrade pip
Collecting pip
  Downloading https://files.pythonhosted.org/packages/54/0c/d01aa759fdc501a58f431eb594a17495f15b88da142ce14b5845662c13f3/pip-20.0.2-py2.py3-none-any.whl (1.4MB)
     |████████████████████████████████| 1.4MB 3.3MB/s
Installing collected packages: pip
  Found existing installation: pip 19.2.3
    Uninstalling pip-19.2.3:
      Successfully uninstalled pip-19.2.3
Successfully installed pip-20.0.2

C:\script>

Use the package

• Packages installed with pip can be used by loading them with the import statement in the same way as the standard library.

import requests

response = requests.get('http://www.nutanix.com/')
print (response.title)

Execution result. Get the page at www.nutanix.com

C:\Users\TatsuhiroMatsumoto\OneDrive - Nutanix\50_Training\@Python\script>test40_requests.py
<!DOCTYPE HTML>
<html lang="en-US">
<head>
    <meta charset="UTF-8"/>
    <title>Nutanix Enterprise Cloud - Run Any Application at Any Scale</title>

Omitted below

How to find a library

• After all, google with "python library 〇〇 (what you want to do)" is the fastest
• The best way to use the standard library is Python official. It's written lightly, but it's written without omission.

This summary

• Package installation is not difficult with pip
• Usage is the same as before
• If you take a quick look around here, it feels like the first step in mastering it.

For Quotations / Lightning Talk

• Most of the things you want to do are realized by others, so look for packages as much as possible. That way you can make better quality products faster.