This document discusses different tools for managing Python environments and dependencies, including pyenv for installing and switching Python versions, virtualenv for creating isolated environments, pipenv and poetry for dependency management, and Anaconda for scientific Python packages. It recommends using pyenv to install Python versions, poetry to manage dependencies and virtual environments, and pipenv as an alternative to poetry.

1. Python
1

2. 5,6
pyenv virtualenv Python
pyenv-virtualenv
2

3. 3

4. • SysML
• pyenv-virtualenv
• Python
4
@cocodrips

5. Python 3STEP

6. 1. Python
2.
3.
6
Python 3STEP

7. Python
•
‣ : ProjectA: Python >= 3.6
ProjectB: Python >= 3.5
• pyenv
7

8. •
‣ :
ProjectA: Tensorflow == 1.15.0
ProjectB: Tensorflow >= 2.1.0
• app docker
8

9. •
‣ pip
requirements.txt
‣ pip freeze
‣
requirements/dev.txt — autopep8 / flake8 …
requirements/tests.txt — pytest …
requirements/prod.txt
•
9

10. Python

11. pip
• PyPI Python
•
pip freeze > requirements.txt
11
O

12. venv
• Python3.3
python3 -m venv /path/to/environment
• activate ( )
source /path/to/environment/bin/activate
12
O

13. 3rdParty

14. pyenv
•
‣ — pyenv install 3.8.1
‣ — pyenv local 3.8.1
•
• (3.8.1)
14
O

15. pipenv
•
• requirements.txt Pipfile / Pipfile.lock
‣ npm / bundler
‣ requirements.txt
• Pipfile Python (PEP)
15
O
O

16. pipenv
•
‣ pipenv —python <python path>
• activate (shell )
‣ pipenv shell
16
O
O

17. pipenv
• pipenv
‣ Pipfile
pipenv install requirements
‣
pipenv install —dev autopep8
‣ Pipfile.lock
pipenv sync
‣ pipfile
pipenv install
17
O
O

18. poetry
• Python project.toml
• setup.py
• npm / bundler poetry.lock
•
18
O
O

19. poetry
19
O
O

20. poetry
• poetry
‣ ( ) — pyproject.toml
poetry new < >
• activate
‣ poetry shell
•
‣
pyenv local new, install ( pipenv )
20
O
O

21. poetry
• poetry
‣ pyproject.toml
poetry add requirements
‣
poetry add —dev autopep8
‣ pyproject.tml
poetry install
‣
poetry build
21
O
O

22. ( ) Anaconda
• STEP
•
•
22
O
O
O

23. ( )
pyenv-virtualenv
• activate
•
pyenv virtualenv < > <env >
• activate
pyenv local <env >
23
O
O

24. Python Before ——> After

25. (before) pyenv-virtualenv + pip
• activate
( )
• (tf2), (tf1)
• …
25

26. (after) pyenv + poetry
•
pyenv
•
‣ python
‣
• pipenv
•
pip pipenv / poetry
26

28. 28
2020 Python - Qiita

29. • Pipfile → pipenv
• requirements.txt → pip + venv
• PyPI → poetry
• →
• — → pip+venv / pipenv
29