This document discusses Python, including installing multiple Python versions on CentOS, creating virtual environments (venv) for different projects, using pip to install packages, and basic concepts like modules, packages, and running Python files. It provides instructions for cloning a Python build script from GitHub, shows commands for installing Python 3.5.2 and listing available Python versions, and demonstrates creating and activating a venv.

1. Python

2. Python

3. 2015 11 (46 )

5. CentOS Python
$ python
Python 2.6.6 (r266:84292, Aug 18 2016, 15:13:37)
[GCC 4.4.7 20120313 (Red Hat 4.4.7-17)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> print "Hello World"
Hello World
>>> exit()

8. CentOS

9. Python
Python3
AWSLambda 2
Go

11. (OLD)
• xbuild
$ git clone https://github.com/tagomoris/xbuild.git
$ cd xbuild
$ ./python-install 3.5.2 ~/local/python-3.5.2

12. •
• https://www.python.org/downloads/
• 3.6.0
•

13. SDK
Python …
% ls /usr/local/bin/python3*
/usr/local/bin/python3@ /usr/local/bin/python3.5m-config@
/usr/local/bin/python3-32@ /usr/local/bin/python3.6@
/usr/local/bin/python3-config@ /usr/local/bin/python3.6-32@
/usr/local/bin/python3.5@ /usr/local/bin/python3.6-config@
/usr/local/bin/python3.5-32@ /usr/local/bin/python3.6m@
/usr/local/bin/python3.5-config@ /usr/local/bin/python3.6m-config@
/usr/local/bin/python3.5m@

14. • venv SDK
% pwd
/Users/kekawano/hoge
% python3.5 -m venv venv
% ls
venv/
% ls venv/
bin/ include/ lib/ pip-selfcheck.json pyvenv.cfg

15. venv
•
• python -m venv
•
• source /bin/activate
•
• deactivate

16. % which python
/usr/bin/python
% source venv/bin/activate
% which python
/Users/kekawano/hoge/venv/bin/python
% python -V
Python 3.5.1
% deactivate
% python -V
Python 2.7.10

17. • pip
% which pip
/Users/kekawano/hoge/venv/bin/pip
% pip install flask
% pip show flask
...
Location: /Users/kekawano/hoge/venv/lib/python3.5/site-packages
...
• venv Global
• PyPI - the Python Package Index : Python Package Index

18. Web
from flask import Flask
app = Flask(__name__)
@app.route("/")
def hello():
return "Hello world!"
if __name__ == "__main__":
app.run()

19. Python
•
• Indented Block
•

20. Python
• async/await
• f-string
• type hinting

21. • module = file
• mod1.py
• package = directory
• mod2/init.py

22. python mod1.py
python mod2
• mod2/main.py