Month: July 2022

How to install Python packages with pipenv, venv or virtualenv package manager

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How to install Python with pyenv version manager

You can find GitHub repository in https://github.com/python-projects-kenanhancer/python_demo

  • Pyenv – Python Runtime Version Manager
    – to install, uninstall, list or switch between different python runtimes
  • Pipenv – Python Package Manager and Virtual environment manager
    – to create an isolated virtual environment with a specific python runtime
    – to install, uninstall, list python packages
  • Venv – Virtual environment manager (for Python 3)
    – to create an isolated virtual environment with a specific python runtime
    – python packages will be isolated already
  • Virtualenv – Virtual environment manager (for Python 2)
    – to create an isolated virtual environment with a specific python runtime
    – python packages will be isolated already

Installing Python Runtime Versions via Pyenv

In order to test different Python Runtime versions, I have installed some versions.

$ pyenv install 3.10.2
$ pyenv install 3.10.3
$ pyenv install 3.10.4
$ pyenv install 3.10.5

I have 4 Python runtime versions(3.10.2, 3.10.3, 3.10.4, 3.10.5) in my machine. So, let's list them.

$ pyenv versions

  system
  3.10.2
  3.10.3
  3.10.4
* 3.10.5 (set by /Users/kenanhancer/.pyenv/version)
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Docker

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Docker is written in the Go programming language.

The Docker daemon

The Docker daemon ( dockerd cli ) listens for Docker API requests and manages Docker objects such as images, containers, networks, and volumes.

A docker daemon can also communicate with other docker daemons to manage Docker services.

The Docker client

The Docker client ( docker cli ) is the primary way to interact with Docker.

When you use commands such as docker run, docker build, docker pull , the Docker client sends these commands to dockerd .

The docker command uses the Docker API.

The Docker client ( docker cli ) can communicate with more than one Docker daemon.

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Linux Terminal Check stdin, stdout and stderr

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When we want to check whether current terminal is attached to stdin, stdout and stderr streams or not, we can use the below codes. I tried with piping, and redirection so both works well.

As seen in below 6 usages, stdin is not listed in output of commands except first one. Because stdin is used by piping or redirection.

$  ([ -t 0 ] && echo stdin; [ -t 1 ] && echo stdout; [ -t 2 ] && echo stderr; echo hello)

stdin
stdout
stderr
hello
$ echo hello | ([ -t 0 ] && echo stdin; [ -t 1 ] && echo stdout; [ -t 2 ] && echo stderr; cat)

stdout
stderr
hello
$ ([ -t 0 ] && echo stdin; [ -t 1 ] && echo stdout; [ -t 2 ] && echo stderr; cat) <<<"hello"

stdout
stderr
hello
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Docker: MySQL, MariaDB, PostgreSQL

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docker-compose.yml

version: '3.4'

services:
  mysql:
    image: mysql:latest
    container_name: mysql
    command: --default-authentication-plugin=mysql_native_password
    restart: always
    environment:
      MYSQL_ROOT_PASSWORD: root
      MYSQL_DATABASE: test_db
      MYSQL_USER: test
      MYSQL_PASSWORD: test
    ports:
      - 3306:3306
    volumes:
      - mysql_db_data_container:/var/lib/mysql:rw
      - ${PWD}/docker/mysql/initdb_sql_scripts:/docker-entrypoint-initdb.d/:ro
      - ${PWD}/docker/mysql/mysql.conf:/etc/mysql/conf.d
    healthcheck:
      test: "/usr/bin/mysql --user=root --password=password --execute \"SHOW DATABASES;\""
      interval: 2s
      timeout: 20s
      retries: 10

  mariadb:
    image: mariadb:latest
    container_name: mariadb
    restart: unless-stopped
    environment:
      MYSQL_ROOT_PASSWORD: root
      MYSQL_DATABASE: test_db
      MYSQL_USER: test
      MYSQL_PASSWORD: test
    ports:
      - 3307:3306
    volumes:
      - mariadb_data_container:/var/lib/mysql:rw
      - ${PWD}/docker/mariadb/initdb_sql_scripts:/docker-entrypoint-initdb.d/:ro
      - ${PWD}/docker/mariadb/mariadb.conf:/etc/mysql/conf.d

  postgres:
    image: postgres:latest
    container_name: postgres
    restart: always
    environment:
      POSTGRES_DB: test_db
      POSTGRES_USER: test
      POSTGRES_PASSWORD: test
    ports:
      - 5432:5432
    volumes:
      - postgres_db_data_container:/var/lib/postgresql/data:rw
      - ${PWD}/docker/postgres/initdb_sql_scripts:/docker-entrypoint-initdb.d:ro
      - ${PWD}/docker/postgres/postgres.conf:/etc/postgresql/postgresql.conf

volumes:
  mysql_db_data_container:
  mariadb_data_container:
  postgres_db_data_container:
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